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.

There has to be a global mission of human progress.

I like progress but I hate change.

To follow the path that others have laid before you is a reasonable course of action; therefore all progress is made by unreasonable men.

Without death there would be very little progress.