I learned very early the difference between knowing the name of something and knowing something.
Show me a family of readers, and I will show you the people who move the world.
To every action there is always an equal and opposite or contrary, reaction
The ability to observe without evaluating is the highest form of intelligence.
The most important part of teaching is to teach what it is to know.
Common sense is the collection of prejudices acquired by age eighteen.
It isn't what we don't know that gives us trouble, it's what we know that ain't so.
Don't learn to do, but learn in doing.
I cannot live without books.
Reading without reflecting is like eating without digesting.
I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion
An investment in knowledge pays the best interest.
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.
The man who does not read good books has no advantage over the man who can't read them.
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.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
The more I read, the more I acquire, the more certain I am that I know nothing.
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.
If you can't explain it simply, you don't understand it well enough.