If you can't explain it simply, you don't understand it well enough.

Courage, conviction and confidence.

Reading without reflecting is like eating without digesting.

The highest result of education is tolerance.

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

No man's knowledge here can go beyond his experience.

Education is the kindling of a flame, not the filling of a vessel.

The more I read, the more I acquire, the more certain I am that I know nothing.

Dare to think for yourself.

Necessity is the mother of invention.

It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.

Opinion is the medium between knowledge and ignorance.

A witty saying proves nothing.

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

Knowing is not enough; we must apply. Willing is not enough; we must do.

Education is the most powerful weapon which you can use to change the world.

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

We could never learn to be brave and patient, if there were only joy in the world

I learned very early the difference between knowing the name of something and knowing something.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.