The books that the world calls immoral are books that show the world its own shame.
A little knowledge that acts is worth infinitely more than much knowledge that is idle.
Real knowledge is to know the extent of one's ignorance.
A thought is an idea in transit.
The progressive development of man is vitally dependent on invention.
To read is to fly: it is to soar to a point of vantage which gives a view over wide terrains of history, human variety, ideas, shared experience and the fruits of many inquiries.
Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.
They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.
Necessity is the mother of invention.
Imagination is more important than knowledge.
The ability to observe without evaluating is the highest form of intelligence.
I like poems you can tack all over with a hammer and there are no hollow places.
The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.
Know what you are talking about.
The deepest sin against the human mind is to believe things without evidence.
All stable processes we shall predict. All unstable processes we shall control.
Evil being the root of mystery, pain is the root of knowledge.
A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.
Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.
Don't worry that children never listen to you; worry that they are always watching you.
Suddenly degrees aren't worth anything. Isn't that true? When I was a student, if you had a degree, you had a job. If you didn't have a job it's because you didn't want one. And I didn't want one, frankly.