In mathematics you don't understand things. You just get used to them.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
It is what you read when you don't have to that determines what you will be when you can't help it.
I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion
The ability to observe without evaluating is the highest form of intelligence.
If you can't explain it simply, you don't understand it well enough.
Don't worry that children never listen to you; worry that they are always watching you.
Patience is a virtue, and I'm learning patience. It's a tough lesson.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
The books that the world calls immoral are books that show the world its own shame.
The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.
Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.
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.
I like poems you can tack all over with a hammer and there are no hollow places.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
Courage, conviction and confidence.
Books are as useful to a stupid person as a mirror is useful to a blind person.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
The first principle is that you must not fool yourself and you are the easiest person to fool.