The greatest sin is to think yourself weak

Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young.

I am not bound to win, but I am bound to be true. I am not bound to succeed, but I am bound to live by the light that I have. I must stand with anybody that stands right, and stand with him while he is right, and part with him when he goes wrong.

When all is said and done, more is said than done.

A goal is not always meant to be reached, it often serves simply as something to aim at.

The time is always right to do the right thing

A thing worth having is a thing worth cheating for.

If you can't feed a hundred people, then just feed one.

Be happy, but never satisfied.

You need a little bit of insanity to do great things.

I'm sorry I wrote you such a long letter; I didn't have time to write a short one.

Employ your time in improving yourself by other men's writings so that you shall come easily by what others have labored hard for.

When I'm good, I'm very good, but when I'm bad, I'm better.

Storms make trees take deeper roots.

Great spirits have always encountered violent opposition from mediocre minds.

Work gives you meaning and purpose and life is empty without it.

Identify your problems but give your power and energy to solutions

We are all motivated by a keen desire for praise, and the better a man is, the more he is inspired by glory.

I may have had a lot of luck in my life, but I still need to find a challenge in the game.

I can never stand still. I must explore and experiment. I am never satisfied with my work. I resent the limitations of my own imagination.

It always seems impossible until it's done.