Be happy, but never satisfied.
The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm.
There are no traffic jams on the extra mile.
When every physical and mental resource is focused, one's power to solve a problem multiplies tremendously.
Human dignity consists in the role we must play in our own perfection. Taking a role in our own self-completion is the highest expression of our creativity.
What does not destroy me, makes me strong.
The number one problem that keeps people from winning in the United States today is lack of belief in themselves.
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.
Motivation is what gets you started. Habit is what keeps you going.
It always seems impossible until it's done.
You must find the place inside yourself where nothing is impossible.
If the only tool you have is a hammer, you tend to see every problem as a nail.
Climbing to the top demands strength, whether it is to the top of Mount Everest or to the top of your career.
We travel. Some of us forever. To seek other states, other lives, other souls.
I have always found that mercy bears richer fruits than strict justice.
Diligence is the mother of good fortune. And idleness, its opposite, never brought a man to the goal of any of his best wishes.
I will never be by violence constrained to do anything.
Most people live and die with their music still unplayed. They never dare to try.
The key to immortality is first living a life worth remembering.
If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.