Discontent is the first necessity of progress.

Relentlessness and discontent are the first necessities of progress.

I didn't fail 1000 times. The light bulb was an invention with 1000 steps.

They say President Wilson has blundered. Perhaps he has, but I notice he usually blunders forward.

Arms alone can give the world no permanent peace, no confident security. Arms are solely for defense - to protect from violent assault what we already have. They are only a costly insurance. They cannot add to human progress.

Without death there would be very little progress.