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.

True progress is slow but sure.

It has been women who have breathed gentleness and care into the harsh progress of mankind.