The same principles which at first view lead to skepticism， pursued to a certain point， bring men back to common sense.

People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.

It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.

对事物感到困惑的能力是所有创造的前提，无论是在艺术还是在科学领域。