"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."

"Faciunt næ intelligendo, ut nihil intelligant."

"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."

"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."

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

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

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

"γνῶθι σεαυτόν."

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

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

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

"Ἕν οἶδα, ὅτι οὐδὲν οἶδα."

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

"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."

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

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

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

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

"Nec scire fas est omnia."

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

"E cœlo descendit nosce te ipsum."

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

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

"Et teneo melius ista quam meum nomen."

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

"Ego te intus et in cute novi."

"Plus scire satius est, quam loqui."

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

"Namque inscitia est, Adversum stimulum calces."

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

"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."

"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."

"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."

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

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

"In vain have you acquired knowledge if you do not impart it it to others."

"He that increaseth knowledge increaseth sorrow."

"The fear of the LORD is the beginning of knowledge: but fools despise wisdom and instruction."

"When wisdom enters your heart"

"Whoever loves discipline loves knowledge."

"O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!"

"O the depth of God’s riches and wisdom and knowledge! How unsearchable his judgments are and beyond tracing out his ways are! For “who has come to know Jehovah’s mind, or who has become his adviser?” Or, “who has first given to him, so that it must be repaid to him?” Because from him and by him and for him are all things. To him be the glory forever. Amen."

"And (mention, O Muhammad), when your Lord said to the angels, "Indeed, I will make upon the earth a successive authority." They said, "Will You place upon it one who causes corruption therein and sheds blood, while we declare Your praise and sanctify You?" He (God) said: Surely, I know what you know not."

"They (angels) said, "Exalted are You; we have no knowledge except what You have taught us. Indeed, it is You who is the Knowing, the Wise.""

"And do not pursue that of which you have no knowledge. Indeed, the hearing, the sight and the heart – about all those (one) will be questioned."

"So high (above all) is God, the Sovereign, the Truth. And, (O Muhammad), do not hasten with (recitation of) the Qur'an before its revelation is completed to you, and say, "My Lord, increase me in knowledge.""

"There is another form of temptation, more complex in its peril. … It originates in an appetite for knowledge. … From this malady of curiosity are all those strange sights exhibited in the theatre. Hence do we proceed to search out the secret powers of nature (which is beside our end), which to know profits not, and wherein men desire nothing but to know."

"Without any delusive representation of images or phantasms, I am most certain that I am, and that I know and delight in this. In respect of these truths, I am not at all afraid of the arguments of the Academicians, who say, What if you are deceived? For if I am deceived, I am. For he who is not, cannot be deceived; and if I am deceived, by this same token I am. And since I am if I am deceived, how am I deceived in believing that I am? for it is certain that I am if I am deceived. Since, therefore, I, the person deceived, should be, even if I were deceived, certainly I am not deceived in this knowledge that I am."

"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."