"The heavens declare the glory of God; and the firmament sheweth his handywork. Day unto day uttereth speech, and night unto night sheweth knowledge."

"Many shall run to and fro, and knowledge shall be increased."

"Through wisdom is an house builded; and by understanding it is established: And by knowledge shall the chambers be filled with all precious and pleasant riches."

"They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea."

"Do you know how God controls the clouds and how he causes the lightning to flash from his cloud? Do you know how the clouds float? These are the wonderful works of the One perfect in knowledge."

"Faciunt næ intelligendo, ut nihil intelligant."

"Namque inscitia est, Adversum stimulum calces."

"Natura semina scientiæ nobis dedit, scientiam non dedit."

"Plus scire satius est, quam loqui."

"Ego te intus et in cute novi."

"Scire tuum nihil est, nisi te scire hoc sciat alter?"

"Et teneo melius ista quam meum nomen."

"Quid nobis certius ipsis Sensibus esse potest? qui vera ac falso notemus."

"Scire est nescire, nisi id me scire alius scierit."

"E cœlo descendit nosce te ipsum."

"Si quid novisti rectius istis. Candidus imperti, si non, his utere mecum."

"Nec scire fas est omnia."

"Nescire autem quid ante quam natus sis acciderit, id est semper esse puerum."

"Minime sibi quisque notus est, et difficillime de se quisque sentit."

"Nam non solum scire aliquid, artis est, sed, quædam ars etiam docendi."

"To wisdom belongs the intellectual apprehension of things eternal; to knowledge, the rational apprehension of things temporal."

"Prima sapientiae clavis definitur, assidua scilicet seu frequens interrogatio … Dubitando enim ad inquisitionem venimus; inquirendo veritatem percipimus."

"Φεῦ φεῦ, φρονεῖν ὡς δεινὸν ἔνθα μὴ τέλη / λύῃ φρονοῦντι..."

"Ἕν οἶδα, ὅτι οὐδὲν οἶδα."

"Πᾶσα τε ἐπιστήμη χωριζομένη δικαιοσύνης καὶ τῆς ἄλλης ἀρετῆς πανουργία, οὐ σοφία φαίνεται."

"Thales was asked what was very difficult; he said: "To know one's self.""

"This is the bitterest pain among men, to have much knowledge but no power."

"γνῶθι σεαυτόν."

"He who chooses to know for the sake of knowing will choose most readily that which is most truly knowledge."

"Πάντες ἄνθρωποι τοῦ εἰδέναι ὀρέγονται φύσει. Σημεῖον δ᾽ ἡ τῶν αἰσθήσεων ἀγάπησις: καὶ γὰρ χωρὶς τῆς χρείας ἀγαπῶνται δι᾽ αὑτάς, καὶ μάλιστα τῶν ἄλλων ἡ διὰ τῶν ὀμμάτων. Οὐ γὰρ μόνον ἵνα πράττωμεν ἀλλὰ καὶ μηθὲν μέλλοντες πράττειν τὸ ὁρᾶν αἱρούμεθα ἀντὶ πάντων ὡς εἰπεῖν τῶν ἄλλων. Αἴτιον δ᾽ ὅτι μάλιστα ποιεῖ γνωρίζειν ἡμᾶς αὕτη τῶν αἰσθήσεων καὶ πολλὰς δηλοῖ διαφοράς."

"All teaching and all intellectual learning come about from already existing knowledge."

"For knowing is spoken of in three ways: it may be either universal knowledge or knowledge proper to the matter in hand or actualising such knowledge; consequently three kinds of error also are possible."

"Everyone in the world knows how to seek for knowledge that they do not have, but do not know how to find what they already know."

"I cannot look at something through someone else's eyes. I can only truly know something which I know."

"To know one's ignorance is the best part of knowledge. To be ignorant of such knowledge is a disease. If one only regards it as a disease, he will be cured of it. The wise man is exempt from this disease. He knows it for what it is, and hence is free from it."

"When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it; this is knowledge."

"The Master said, "Yu, shall I teach you what knowledge is? When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it; — this is knowledge.""

"This statistical regularity in moral affairs fully establishes their being under the presidency of law. Man is now seen to be an enigma only as an individual; in the mass he is a mathematical problem."

"Since the end of World War II, I have been working on the many ramifications of the theory of messages. Besides the electrical engineering theory of the transmission of messages, there is a larger field which includes not only the study of language but the study of messages as a means of controlling machinery and society, the development of computing machines and other such automata, certain reflections upon psychology and the nervous system, and a tentative new theory of scientific method. This larger theory of messages is a probabilistic theory, an intrinsic part of the movement that owes its origin to Willard Gibbs and which I have described in the introduction."

"At a purely formal level, one could call probability theory the study of measure spaces with total measure one, but that would be like calling number theory the study of strings of digits which terminate."

"Why do [people] confuse probability and expectation, that is, probability and probability times payoff? Mainly because much... schooling comes from examples in symmetric environments... the... bell curve... is entirely symmetric."

"The theory of probability combines commonsense reasoning with calculation. It domesticates luck, making it subservient to reason."

"Einstein's supreme greatness was in transforming physical thinking from that of the culmination of classical physics about 1900 to that of quantum mechanics starting about 1925. ...far more than anyone else, he caused physicists to think in terms of probabilities. He began to do this in his early work in thermodynamics, and he brought such thinking to its first great fruition in 1905 in his work on Brownian movement and in his first work on radiation, in which he introduced the concept of light quanta or photons. Its second, even greater fruition was in his famous paper on the quantum theory of radiation in 1917. That paper illustrated methods that have been in use almost without change ever since, even though the majority of the users have no knowledge that it was Einstein who propounded them. It was in this paper that Einstein postulated the various transition possibilities between two states of a quantized system. ...quantum theory has existed ever since precisely for the purpose of evaluating these probabilities. In this paper of 1917 Einstein postulated in particular the process known as stimulated emission, and inferred the properties of this process. This is the process employed in the... light maser or laser."

"In applying dynamical principles to the motion of immense numbers of atoms, the limitation of our faculties forces us to abandon the attempt to express the exact history of each atom, and to be content with estimating the average condition of a group of atoms large enough to be visible. This method... which I may call the statistical method, and which in the present state of our knowledge is the only available method of studying the properties of real bodies, involves an abandonment of strict dynamical principles, and an adoption of the mathematical methods belonging to the theory of probability. … If the actual history of Science had been different, and if the scientific doctrines most familiar to us had been those which must be expressed in this way, it is possible that we might have considered the existence of a certain kind of contingency a self evident truth, and treated the doctrine of philosophical necessity as a mere sophism."

"Feeling threatened is not the same as being threatened, but the difference gets lost. The danger from low levels of radiation is quite low, as expressed as morbidity statistics or probabilities, but there is an unfortunate lack of connection to probability in the average person. Low probabilities are a particular problem of perception. If they were not, then nobody would play the lottery and the gambling industry would collapse."

"The laws of probability are mighty powerful, and they never sleep. If this were more widely understood there’d be a lot less crowing about good luck, and a lot less guilt about bad luck. And we’d have a more civilized world. Some things really do happen by chance, and there is little we can do to change that."

"People seem to flinch at the word probability—it has too many syllables. Besides, it sounds mathematical, and it’s become politically correct in our country to be proud of not knowing any mathematics. (We’re already paying the price for that.)"