Optimism is essential to achievement and it is also the foundation of courage and true progress.

Many peoples’ tombstones should read ‘Died at 30, burried at 60.’

America is the best half-educated country in the world.

Optimism is essential to achievement and it is also the foundation of courage and true progress.

Necessity does the work of courage.

An expert is one who knows more and more about less and less.

Optimism is the foundation of courage.