God doesn't promise security from life's storms but security in life's storms. God doesn't always call the equipped, but he will always equip the called. In the long run, avoiding danger is no safer than outright exposure. The fearful are caught as often as the bold.

The highest thinkers of the ages, the seers of the tribes and the nations, have been optimists.

World peace will never come until the passion of supremacy is combated.

People are too prone to think that the actual is the limit of possibility. They believe that all that has been done is all that can be done.

It is for us to pray not for tasks equal to our powers, but for powers equal to our tasks, to go forward with a great desire forever beating at the door of our hearts as we travel toward our distant goal.

Now I feel as if I should succeed in doing something in mathematics, although I cannot see why it is so very important. . . The knowledge doesn't make life any sweeter or happier, does it?

The most beautiful world is always entered through imagination.