If the facts don't fit the theory, change the facts.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
The fullness of knowledge only comes through the awareness of ignorance.
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 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.
They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.
The schools ain't what they used to be and never was.
All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
When you know better you do better.
Investigate, educate and organize.
I cannot live without books.
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.
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.
Those who fail to learn the lessons of history are doomed to repeat them.
What sculpture is to a block of marble, education is to a human soul.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
The only true wisdom is in knowing you know nothing.
The only good is knowledge and the only evil is ignorance.
Reading is to the mind what exercise is to the body.
Make it a rule never to give a child a book you would not read yourself.
If I have seen further it is by standing on the shoulders of Giants.