Opinion is the medium between knowledge and ignorance.
It is what you read when you don't have to that determines what you will be when you can't help it.
There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.
All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
It is possible to fly without motors, but not without knowledge and skill.
Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
It isn't what we don't know that gives us trouble, it's what we know that ain't so.
A cynic is a man who knows the price of everything, and the value of nothing.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
Books are for people who wish they were somewhere else.
One test of the correctness of educational procedure is the happiness of the child.
The books that the world calls immoral are books that show the world its own shame.
You can never be overdressed or overeducated.
If you can't explain it simply, you don't understand it well enough.
Evil being the root of mystery, pain is the root of knowledge.
As we acquire more knowledge, things do not become more comprehensible but more mysterious.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
The highest activity a human being can attain is learning for understanding, because to understand is to be free.
Knowledge, Action, Devotion are complementary to each other.
Knowing is not enough; we must apply. Willing is not enough; we must do.