One fails forward toward success.

Every father should remember that one day his son will follow his example, not his advice.

A problem well stated is a problem half- solved.

There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.

99 percent of success is built on failure.

The only time you mustn’t fail is the last time you try.

This problem, too, will look simple after it is solved.

The world hates change, yet it is the only thing that has brought progress.

Public speaking is the art of diluting a two- minute idea with a two-hour vocabulary.

Think twice before you speak, and then you may be able to say something more insulting than if you spoke right out at once.