You learn by doing and falling over.

Everything good is costly and the development of the personality is one of the most costly of all things. It will cost you your innocence, your illusions, your certainty.

I do not believe in a fate that falls on men however they act; but I do believe in a fate that falls on them unless they act.

You will learn and grow according to the nature and consequences of your actions.

The measure of success is not whether you have a tough problem to deal with, but whether it's the same problem you had last year.

A happy life consists not in the absence, but in the mastery of hardships.

The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.