It isn't what we don't know that gives us trouble, it's what we know that ain't so.

I am indebted to my father for living, but to my teacher for living well.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

In mathematics you don't understand things. You just get used to them.

The first idea the child must acquire is that of the difference between good and evil.

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

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

What we know is a drop, what we don't know is an ocean.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

I have no special talents. I am only passionately curious.

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

Don't worry that children never listen to you; worry that they are always watching you.

A thought is an idea in transit.

I cannot live without books.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

Better know nothing than half-know many things.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

Words can be like X-rays if you use them properly - they'll go through anything. You read and you?re pierced.

The fullness of knowledge only comes through the awareness of ignorance.