There is something noble in hearing myself ill spoken of, when I am doing well.

There are so many worlds and I have not yet conquered even one.

I am indebted to my father for living, but to my teacher for living well.

As for a limit to one’s labors, I, for one, do not recognize any for a high-minded man, except that the labors themselves should lead to noble accomplishments.

Through every generation of the human race there has been a constant war, a war with fear. Those who have the courage to conquer it are made free and those who are conquered by it are made to suffer until they have the courage to defeat it, or death takes them.

There is nothing impossible to him who will try.

Heaven cannot brook two suns, nor earth two masters.