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.
As we acquire more knowledge, things do not become more comprehensible but more mysterious.
Know what you are talking about.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
Dare to think for yourself.
Imagination is more important than knowledge.
The books that the world calls immoral are books that show the world its own shame.
My weapon is literature
The first idea the child must acquire is that of the difference between good and evil.
If you want the present to be different from the past, study the past.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
If you're not learning while you're earning, you're cheating yourself out of the better portion of your compensation.
Courage, conviction and confidence.
A witty saying proves nothing.
I do not know how to teach philosophy without becoming a disturber of the peace.
The schools ain't what they used to be and never was.
Learning never exhausts the mind.
A little knowledge is a dangerous thing. So is a lot.
The first principle is that you must not fool yourself and you are the easiest person to fool.
No power and no treasure can outweigh the extension of our knowledge.