What is freedom of expression? Without the freedom to offend, it ceases to exist.
Knowledge becomes evil if the aim be not virtuous.
I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
The most savage controversies are those about matters as to which there is no good evidence either way.
It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.
A thought is an idea in transit.
The first idea the child must acquire is that of the difference between good and evil.
Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
Courage, conviction and confidence.
There is nothing more awful, insulting, and depressing than banality.
Books are for people who wish they were somewhere else.
The reading of all good books is like conversation with the finest men of past centuries.
The most important part of teaching is to teach what it is to know.
If you can't explain it simply, you don't understand it well enough.
The great difficulty in education is to get experience out of ideas.
I cannot live without books.
What we know is a drop, what we don't know is an ocean.
Words can be like X-rays if you use them properly - they'll go through anything. You read and you?re pierced.
I do not know how to teach philosophy without becoming a disturber of the peace.
Science is not only a disciple of reason but, also, one of romance and passion.