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It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to step into its waters.

Human behavior flows from three main sources: desire, emotion, and knowledge.

And what, Socrates, is the food of the soul? Surely, I said, knowledge is the food of the soul.

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.

The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant.

Opinion is the medium between knowledge and ignorance.

Knowledge without justice ought to be called cunning rather than wisdom.

All the knowledge I possess everyone else can acquire, but my heart is all my own.

There is much pleasure to be gained from useless knowledge.

The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery.

Knowledge which is acquired under compulsion obtains no hold on the mind.

Knowledge is true opinion.

The only real security that a man can have in this world is a reserve of knowledge, experience and ability.

Doubt grows with knowledge.

Let us tenderly and kindly cherish, therefore, the means of knowledge. Let us dare to read, think, speak, and write.

We know accurately only when we know little, with knowledge doubt increases.

One whose knowledge is confined to books and whose wealth is in the possession of others, can use neither his knowledge nor wealth when the need for them arises.

Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again.