Quotes

Those who know do not speak; those who speak do not know.

The gentleman is ashamed when his words exceed his deeds.

Is it not a pleasure to learn and, in due time, to practise what one has learned?

All men by nature desire to know.

There is only one good, knowledge, and one evil, ignorance.

Extraordinary claims require extraordinary evidence.

It is only with the heart that one can see rightly; what is essential is invisible to the eye.

Above all, do not lie to yourself.

Ignorance more frequently begets confidence than does knowledge.

Books, my brothers, books, not bells and baubles!

I would rather be a man of paradoxes than a man of prejudices.

All things excellent are as difficult as they are rare.