Discontent is the first necessity of progress.

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

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

Restlessness and discontent are the first necessities of progress.

Restlessness and discontent are the necessities of progress.

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