Samuel Beckett

Ever tried.
Ever failed.
No matter.
Try again.
Fail again.
Fail better.

Thomas Alva Edison

I haven’t failed.
I’ve just found 10,000 ways that won’t work.

George Bernard Shaw

The reasonable man adapts himself to the conditions that surround him.
The unreasonable man adapts surrounding conditions to himself.
All progress depends on the unreasonable man.