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.