Know what you are talking about.
Knowing others is wisdom, knowing yourself is Enlightenment.
A witty saying proves nothing.
If you can't explain it simply, you don't understand it well enough.
To educate a person in the mind but not in morals is to educate a menace to society.
Show me a family of readers, and I will show you the people who move the world.
I am so clever that sometimes I don't understand a single word of what I am saying.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
It isn't what we don't know that gives us trouble, it's what we know that ain't so.
Common sense is the collection of prejudices acquired by age eighteen.
The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
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.
I think that kids have a greater capacity for processing things than we give them credit for.
If I have seen further it is by standing on the shoulders of Giants.
Education is an ornament for the prosperous, a refuge for the unfortunate.
Knowing is not enough; we must apply. Willing is not enough; we must do.
I do not know how to teach philosophy without becoming a disturber of the peace.
The deepest sin against the human mind is to believe things without evidence.
Science is not only a disciple of reason but, also, one of romance and passion.