No one knows how big your potential is, how big your heart is, when you start.
I intend to act forever if I can.
The stars shall fade away, the sun himself Grow dim with age, and nature sink in years, But thou shalt flourish in immortal youth, Unhurt amidst the wars of elements, The wrecks of matter, and the crush of worlds.
What we need is endless courage.
Somehow, I've been blessed to be able to have the young spirit inside - not feel like every year I get a year older. I feel like every year I get a year younger. I don't wake up in the morning with aches and pains.
I shall be active and vigorous even from the tomb.
It is the perennial youthfulness of mathematics itself which marks it off with a disconcerting immortality from the other sciences.
Great lives never go out; they go on.
In this business, you have to have what they call an idiotic determination to succeed.
