If the facts don't fit the theory, change the facts.
The deepest sin against the human mind is to believe things without evidence.
The only true wisdom is in knowing you know nothing.
Study without desire spoils the memory, and it retains nothing that it takes in.
Don't learn to do, but learn in doing.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
Reading without reflecting is like eating without digesting.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
Education is the most powerful weapon which you can use to change the world.
Common sense is the collection of prejudices acquired by age eighteen.
I cannot live without books.
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.
A little knowledge that acts is worth infinitely more than much knowledge that is idle.
If you're not learning while you're earning, you're cheating yourself out of the better portion of your compensation.
If I have seen further it is by standing on the shoulders of Giants.
Imagination is more important than knowledge.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
Any sufficiently advanced technology is indistinguishable from magic.
Investigate, educate and organize the country must progress, productive works and industries are the main avenues at present next to education for the advancement of the country
The first principle is that you must not fool yourself and you are the easiest person to fool.
I like poems you can tack all over with a hammer and there are no hollow places.