Perseverance is failing 19 times and succeeding the 20th.

I think nature's imagination Is so much greater than man's, she's never going to let us relax.

Nothing great was ever achieved without enthusiasm.

Every problem has in it the seeds of its own solution. If you don't have any problems, you don't get any seeds.

Only the wisest and stupidest of men never change.

The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.

Scar tissue is stronger than regular tissue. Realize the strength, move on.

Never look back unless you are planning to go that way.

As long as I'm in great shape, nobody beats me, for sure.

Do not be afraid. Do not be satisfied with mediocrity. Put out into the deep and let down your nets for a catch.

A hero is no braver than an ordinary man, but he is brave five minutes longer.

All thinking men are atheists.

The unexamined life is not worth living.

The one excellent thing that can be learned from a lion is that whatever a man intends doing should be done by him with a whole-hearted and strenuous effort.

It is greed to do all the talking but not to want to listen at all.

One person with a belief is equal to a force of ninety-nine who have only interests.

Knowing what's right doesn't mean much unless you do what's right.

Dare to be free, dare to go as far as your thought leads, and dare to carry that out in your life.

I believe that every person is born with talent.

Life is entrusted to man as a treasure which must not be squandered, as a talent which must be used well.

My advice to other disabled people would be, concentrate on things your disability doesn't prevent you doing well, and don't regret the things it interferes with. Don't be disabled in spirit as well as physically.