Great spirits have always encountered opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blindly to conventional prejudices and chooses instead to express his opinions courageously and honestly.
I never think of the future - it comes soon enough.
Be not ashamed of mistakes and thus make them crimes.
I hear and I forget. I see and I remember. I do and I understand.
To see what is right and not to do it is want of courage.
Have no friends not equal to yourself.
Enjoy when you can, and endure when you must.