I used to think I had ambition...

By Rachel Field

I used to think I had ambition - but now I'm not so sure. It may have been only discontent. They're easily confused.

— Rachel Field


Source

Rachel Field was an American writer and poet. This quote is dialogue in her novel All This And Heaven Too, first published in 1938 and later made into a movie of the same name.

If necessity is the mother of invention, discontent is the father of progress.

— David Rockefeller

Restlessness is discontent and discontent is the first necessity of progress. Show me a thoroughly satisfied man and I will show you a failure.

— Thomas Edison