First Quote Added
April 10, 2026
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"Rules necessary for demonstrations. To prove all propositions, and to employ nothing for their proof but axioms fully evident of themselves, or propositions already demonstrated or admitted; Never to take advantage of the ambiguity of terms by failing mentally to substitute definitions that restrict or explain them."
"Rules necessary for axioms. Not to demand in axioms any but things perfectly evident."
"Rules necessary for definitions. Not to leave any terms at all obscure or ambiguous without definition; Not to employ in definitions any but terms perfectly known or already explained."
"Five [of the above] rules are of absolute necessity, and cannot be dispensed with without essential defect and often without error."
"These eight rules [above] contain all the precepts for solid and immutable proofs."
"Rules for Demonstrations. I. Not to undertake to demonstrate any thing that is so evident of itself that nothing can be given that is clearer to prove it. II. To prove all propositions at all obscure, and to employ in their proof only very evident maxims or propositions already admitted or demonstrated. III. To always mentally substitute definitions in the place of things defined, in order not to be misled by the ambiguity of terms which have been restricted by definitions."
"Rules for Axioms. I. Not to omit any necessary principle without asking whether it is admittied, however clear and evident it may be. II. Not to demand, in axioms, any but things that are perfectly evident in themselves."
"Rules for Definitions. I. Not to undertake to define any of the things so well known of themselves that the clearer terms cannot be had to explain them. II. Not to leave any terms that are at all obscure or ambiguous without definition. III. Not to employ in the definition of terms any words but such as are perfectly known or already explained."
"A few rules include all that is necessary for the perfection of the definitions, the axioms, and the demonstrations, and consequently of the entire method of the geometrical proofs of the art of persuading."
"If we do not secure the foundation, we cannot secure the edifice."
"This art, which I call the art of persuading, and which, properly speaking, is simply the process of perfect methodical proofs, consists of three essential parts: of defining the terms of which we should avail ourselves by clear definitions, of proposing principles of evident axioms to prove the thing in question; and of always mentally substituting in the demonstrations the definition in the place of the thing defined."
"There are hardly any truths upon which we always remain agreed, and still fewer objects of pleasure which we do not change every hour, I do not know whether there is a means of giving fixed rules for adapting discourse to the inconstancy of our caprices."
"The principles of pleasure are not firm and stable. They are different in all mankind, and variable in every particular with such a diversity that there is no man more different from another than from himself at different times."
"The art of persuasion consists as much in that of pleasing as in that of convincing, so much more are men governed by caprice than by reason!"
"It is necessary to have regard to the person whom we wish to persuade, of whom we must know the mind and the heart, what principles he acknowledges, what things he loves; and then observe in the thing in question what affinity it has with the acknowledged principles, or with the objects so delightful by the pleasure which they give him."
"A doubtful balance is made between truth and pleasure, and... the knowledge of one and the feeling of the other stir up a combat the success of which is very uncertain, since, in order to judge of it, it would be necessary to know all that passes in the innermost spirit of the man, of which man himself is scarcely ever conscious."
"As soon as the soul has been made to perceive that a thing can conduct it to that which it loves supremely, it must inevitably embrace it with joy."
"Several particular maxims... are as powerful, although false, in carrying away belief, as those the most true."
"Of the truths within our reach... the mind and the heart are as doors by which they are received into the soul, but... few enter by the mind, whilst they are brought in crowds by the rash caprices of the will, without the council of reason."
"God only pours out his light into the mind after having subdued the rebellion of the will by an altogether heavenly gentleness which charms and wins it."
"They [men] have corrupted this [God's supernatural] order by making profane things what they should make of holy things, because in fact, we believe scarcely any thing except which pleases us."
"Whilst in speaking of human things, we say that it is necessary to know them before we can love them...the saints on the contrary say in speaking of divine things that it is necessary to love them in order to know them, and that we only enter truth through charity."
"I do not speak here of divine truths... because they are infinitely superior to nature: God alone can place them in the soul... I know that he has desired that they should enter from the heart into the mind, and not from the mind into the heart, to humiliate that proud power of reasoning that pretends to the right to be the judge of the things that the will chooses; and to cure this infirm will which is wholly corrupted by its filthy attachments."
"All men are almost led to believe not of proof, but by attraction. This way is base, ignoble, and irrelevant; every one therefore disavows it. Each one professes to believe and even to love nothing but what he knows to be worthy of belief and love."
"No one is ignorant that there are two avenues by which opinions are received into the soul, which are its two principal powers: the understanding and the will."
"C'est une maladie naturelle à l'homme de croire qu'il possède la vérité directement…"
"These philosophers of the world place contrarieties in the same subject; for the one attributed greatness to nature and the other weakness to this same nature, which could not subsist; whilst faith teaches us to place them in different subjects: all that is infirm belonging to nature, all that is powerful belonging to grace. Such is the marvelous and novel union which God alone could teach, and which he alone could make, and which is only a type and an effect of the ineffable union of two natures in the single person of a Man-God."
"We all want progress. But progress means getting nearer to the place where you want to be. And if you have taken a wrong turning, then to go forward does not get you any nearer. If you are on the wrong road, progress means doing an about-turn and walking back to the right road; in that case the man who turns back soonest is the most progressive man."
"There is one thing, and only one, in the whole universe which we know more about than we could learn from external observation. That one thing is Man. We do not merely observe men, we are men. In this case we have, so to speak, inside information; we are in the know."
"The most dangerous thing you can do is to take any one impulse of your own nature and set it up as the thing you ought to follow at all costs. There is not one of them which will not make us into devils if we set it up as an absolute guide. You might think love of humanity in general was safe, but it is not. If you leave out justice you will find yourself breaking agreements and faking evidence in trials "for the sake of humanity", and become in the end a cruel and treacherous man."
"This year, or this month, or, more likely, this very day, we have failed to practise ourselves the kind of behaviour we expect from other people."
"When you have reached your own room, be kind to those who have chosen different doors and to those who are still in the hall. If they are wrong they need your prayers all the more; and if they are your enemies, then you are under orders to pray for them. That is one of the rules common to the whole house."
"All their life in this world and all their adventures in Narnia had only been the cover and the title page: now at last they were beginning Chapter One of the Great Story which no one on earth has read: which goes on for ever: in which every chapter is better than the one before."
"The trouble about trying to make yourself stupider than you really are is that you very often succeed."
"It is the stupidest children who are most childish and the stupidest grown-ups who are most grown-up."
"There was a boy called Eustace Clarence Scrubb, and he almost deserved it."
"This is where dreams—dreams, do you understand—come to life, come real. Not daydreams: dreams."
"To know what would have happened, child? No. Nobody is ever told that."
"Who believes in Aslan nowadays?"
"Though the Witch knew the Deep Magic, there is a magic deeper still which she did not know. Her knowledge goes back only to the dawn of Time."
"Some day you will be old enough to start reading fairy tales again."
"When I attempted, a few minutes ago, to describe our spiritual longings, I was omitting one of their most curious characteristics. We usually notice it just as the moment of vision dies away, as the music ends or as the landscape loses the celestial light. What we feel then has been well described by Keats as “the journey homeward to habitual self.” You know what I mean. For a few minutes we have had the illusion of belonging to that world. Now we wake to find that it is no such thing. We have been mere spectators. Beauty has smiled, but not to welcome us; her face was turned in our direction, but not to see us. We have not been accepted, welcomed, or taken into the dance. We may go when we please, we may stay if we can: “Nobody marks us.” A scientist may reply that since most of the things we call beautiful are inanimate, it is not very surprising that they take no notice of us. That, of course, is true. It is not the physical objects that I am speaking of, but that indescribable something of which they become for a moment the messengers. And part of the bitterness which mixes with the sweetness of that message is due to the fact that it so seldom seems to be a message intended for us but rather something we have overheard. By bitterness I mean pain, not resentment. We should hardly dare to ask that any notice be taken of ourselves. But we pine. The sense that in this universe we are treated as strangers, the longing to be acknowledged, to meet with some response, to bridge some chasm that yawns between us and reality, is part of our inconsolable secret. And surely, from this point of view, the promise of glory, in the sense described, becomes highly relevant to our deep desire. For glory meant good report with God, acceptance by God, response, acknowledgment, and welcome into the heart of things. The door on which we have been knocking all our lives will open at last."
"If there is equality, it is in His love, not in us."
"At present we are on the outside of the world, the wrong side of the door. We discern the freshness and purity of the morning, but they do not make us fresh and pure. We cannot mingle with the splendours we see. But all the leaves of the New Testament are rustling with the rumour that it will not always be so. Some day, God willing, we shall get in."
"It is a serious thing to live in a society of possible gods and goddesses, to remember that the dullest most uninteresting person you talk to may one day be a creature which, if you saw it now, you would be strongly tempted to worship, or else a horror and a corruption such as you now meet, if at all, only in a nightmare. All day long we are, in some degree helping each other to one or the other of these destinations. It is in the light of these overwhelming possibilities, it is with the awe and the circumspection proper to them, that we should conduct all of our dealings with one another, all friendships, all loves, all play, all politics. There are no ordinary people. You have never talked to a mere mortal. Nations, cultures, arts, civilizations — these are mortal, and their life is to ours as the life of a gnat. But it is immortals whom we joke with, work with, marry, snub, and exploit — immortal horrors or everlasting splendors."
"Indeed, if we consider the unblushing promises of reward and the staggering nature of the rewards promised in the Gospels, it would seem that Our Lord finds our desires, not too strong, but too weak. We are half-hearted creatures, fooling about with drink and sex and ambition when infinite joy is offered us, like an ignorant child who wants to go on making mud pies in a slum because he cannot imagine what is meant by the offer of a holiday at the sea. We are far too easily pleased."
"100 per cent of us die, and the percentage cannot be increased."
"We live, in fact, in a world starved for solitude, silence, and privacy: and therefore starved for meditation and true friendship."
"As long as this deliberate refusal to understand things from above, even where such understanding is possible, continues, it is idle to talk of any final victory over materialism."
"Perfect humility dispenses with modesty."