It isn't what we don't know that gives us trouble, it's what we know that ain't so.
There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
The first principle is that you must not fool yourself and you are the easiest person to fool.
Seek knowledge from the cradle to the grave.
I am a part of everything that I have read.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
When you know better you do better.
Never help a child with a task at which he feels he can succeed.
Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
My alma mater was books, a good library.... I could spend the rest of my life reading, just satisfying my curiosity.
Reading without reflecting is like eating without digesting.
Necessity is the mother of invention.
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.
There is nothing more awful, insulting, and depressing than banality.
Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
A thought is an idea in transit.
There is no authority who decides what is a good idea.
My weapon is literature