I will never be by violence constrained to do anything.
Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.
Work gives you meaning and purpose and life is empty without it.
I not only use all the brains that I have, but all that I can borrow.
Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young.
Duty does not require any person to submit to the destruction of his personal ambitions and the right to live his own life in his own way.
No great discovery was ever made without a bold guess.
This is one small step for a man, one giant leap for mankind.
Impossible is a word to be found only in the dictionary of fools.
When I'm good, I'm very good, but when I'm bad, I'm better.
Stop acting so small. You are the universe in ecstatic motion.
Once you learn to quit, it becomes a habit.
The key to immortality is first living a life worth remembering.
If the only tool you have is a hammer, you tend to see every problem as a nail.
We could all take a lesson from crayons: some are sharp, some are beautiful, some have weird names, and all are different colors, but they still learn to live in the same box...
People who say it cannot be done should not interrupt those who are doing it.
Don't get set into one form, adapt it and build your own, and let it grow, be like water.
Only the wisest and stupidest of men never change.
A man's work is nothing but this slow trek to rediscover, through the detours of art, those two or three great and simple images in whose presence his heart first opened.
Nothing is impossible, the word itself says 'I am possible'
Do not look for approval except for the consciousness of doing your best.