That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.

When you know better you do better.

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

The reading of all good books is like conversation with the finest men of past centuries.

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

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

Knowing others is wisdom, knowing yourself is Enlightenment.

The only true wisdom is in knowing you know nothing.

Make it a rule never to give a child a book you would not read yourself.

The first principle is that you must not fool yourself and you are the easiest person to fool.

The direction in which education starts a man will determine his future in life

Science is what we have learned about how to keep from fooling ourselves.

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

I do not know how to teach philosophy without becoming a disturber of the peace.

If you want the present to be different from the past, study the past.

Science is not only a disciple of reason but, also, one of romance and passion.

A spirit of national masochism prevails, encouraged by an effete corps of impudent snobs who characterize themselves as intellectuals.

The real solution lies in a world in which charity will have become unnecessary.

The schools ain't what they used to be and never was.

The only good is knowledge and the only evil is ignorance.

Many much-learned men have no intelligence.