A good head and a good heart are always a formidable combination.

I have a great respect for incremental improvement, and I've done that sort of thing in my life, but I've always been attracted to the more revolutionary changes. I don't know why. Because they're harder. They're much more stressful emotionally. And you usually go through a period where everybody tells you that you've completely failed.

It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to, than I have ever known.

Those revolutionaries who have, by chance, escaped the gallows should live and show to the world that they cannot only embrace gallows for the ideal but also bear the worst type of tortures in the dark, dingy prison cells.

Those who oppose change are addicted to the luxury of their comfort zone.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.

 When I am overcome by an inflated ego, I think of the lofty mountains.

A man who was completely innocent, offered himself as a sacrifice for the good of others, including his enemies, and become the ransom of the world. It was a perfect act.

Courage is rightly esteemed the first of human qualities... because it is the quality which guarantees all others.  

Important principles may, and must, be inflexible.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

Look at the sky. We are not alone. The whole universe is friendly to us and conspires only to give the best to those who dream and work.