Opinion is the medium between knowledge and ignorance.
The deepest sin against the human mind is to believe things without evidence.
The first idea the child must acquire is that of the difference between good and evil.
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.
The great difficulty in education is to get experience out of ideas.
The most savage controversies are those about matters as to which there is no good evidence either way.
It is possible to fly without motors, but not without knowledge and skill.
Men are born ignorant, not stupid. They are made stupid by education.
A child miseducated is a child lost.
Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion
Evil being the root of mystery, pain is the root of knowledge.
What we know is a drop, what we don't know is an ocean.
Don't worry that children never listen to you; worry that they are always watching you.
I learned very early the difference between knowing the name of something and knowing something.
The whole of science is nothing more than a refinement of everyday thinking.
A cynic is a man who knows the price of everything, and the value of nothing.
They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
The reading of all good books is like conversation with the finest men of past centuries.
It is beyond a doubt that all our knowledge begins with experience.