All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
Patience is a virtue, and I'm learning patience. It's a tough lesson.
I am a part of everything that I have read.
What we know is a drop, what we don't know is an ocean.
Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.
If the facts don't fit the theory, change the facts.
Reading without reflecting is like eating without digesting.
Knowing is not enough; we must apply. Willing is not enough; we must do.
Investigate, educate and organize.
Real knowledge is to know the extent of one's ignorance.
I am so clever that sometimes I don't understand a single word of what I am saying.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
The deepest sin against the human mind is to believe things without evidence.
An investment in knowledge pays the best interest.
No power and no treasure can outweigh the extension of our knowledge.
The great difficulty in education is to get experience out of ideas.
Know what you are talking about.
Education is a system of imposed ignorance.
Opinion is the medium between knowledge and ignorance.
The progressive development of man is vitally dependent on invention.