Learned we may be with another man's learning: we can only be wise with wisdom of our own.

Wisdom... comes not from age, but from education and learning.

Courage is resistance to fear, mastery of fear - not absence of fear.

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

Choose rather to be strong of soul than strong of body.

Nature is pleased with simplicity. And nature is no dummy

To me, being an intellectual doesn't mean knowing about intellectual issues; it means taking pleasure in them.

Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy.

We are all born ignorant, but one must work hard to remain stupid

Having a great intellect is no path to being happy.

You can best serve civilization by being against what usually passes for it.

We never see ourselves as others see us.

A wise man can learn more from a foolish question than a fool can learn from a wise answer.

Take care of the pieces well. The whole will take care of itself.

I think, therefore I am.

Accuracy is the twin brother of honesty; inaccuracy, of dishonesty.

What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.

It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt.

One who loses wealth loses much. One who loses a friend loses more. But one who loses courage loses all.

It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.

Fear doesn't exist anywhere except in the mind.