Ideas are the source of all things
The life which is not examined is not worth living.
Do not use compulsion, but let early education be rather a sort of amusement.
Thinking is the soul talking to itself.
It is better to be wise, and not to seem so, than to seem wise, and not be so; yet men, for the most part, desire the contrary.
As it is, the lover of inquiry must follow his beloved wherever it may lead him.