Never discourage anyone who continually makes progress, no matter how slow.
I'm a slow walker, but I never walk back.
It always seems impossible until it's done.
When a blind man carries a lame man both go forward.
Hiroshima teaches us that we’re doomed if science progresses but our morals don’t
A person who makes few mistakes makes little progress.
Be not afraid of going slowly, be afraid only of standing still.
Without a struggle, there can be no progress.
Live to live and you will learn to live.
Where we cannot invent, we may at least improve.
Honest disagreement is often a good sign of progress.
Is it progress if a cannibal uses a fork?
I walk slowly, but I never walk backward.
When any real progress is made, we unlearn and learn anew what we thought we knew before.
He who stops being better stops being good.