The belief that youth is the happiest time of life is founded upon a fallacy. The happiest person is the person who thinks the most interesting thoughts, and we grow happier as we grow older.

Self-complacency is fatal to progress.

Liberty is not a gift that can be given; it is a right that must be taken.

Courage is the price that life exacts for granting peace.

Learn everything that is good from others, but bring it in, and in your own way absorb it; do not become others.

Never think that war, no matter how necessary, nor how justified, is not a crime.

Success is not about seeking constant external rewards; it's about finding intrinsic satisfaction and fulfillment in the pursuit of your goals.