Without ambition one starts nothing. Without work one finishes nothing. The prize will not be sent to you. You have to win it.
Great spirits have always encountered violent opposition from mediocre minds.
Be miserable. Or motivate yourself. Whatever has to be done, it's always your choice.
Once you learn to quit, it becomes a habit.
I want to know what passion is. I want to feel something strongly.
The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm.
The starting point of all achievement is desire.
The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.
A pure hand needs no glove to cover it.
There is only one corner of the universe you can be certain of improving, and that's your own self.
When I give, I give myself.
Do not count your chickens before they are hatched.
Truth can be stated in a thousand different ways, yet each one can be true.
If you don't know, the thing to do is not to get scared, but to learn.
How long should you try? Until.
The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
Trust in dreams, for in them is hidden the gate to eternity.
A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light.
My optimism wears heavy boots and is loud.
Nobody can hurt me without my permission.
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.