Healthy discontent is the prelude to progress.

Healthy discontent is the prelude to 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.

Intelligent discontent is the mainspring of civilization. Progress is born of agitation. It is agitation or stagnation.

Discontent is the first necessity of progress.

Restlessness and discontent are the first necessities of progress.