Who said "The reward of a thing well done is having done it."?

This quote is attributed to O. Henry.

The reward of a thing well done is having done it. - O. Henry

"The reward of a thing well done is having done it."

O. Henry

Writer American 1862–1910

"Turn up the lights. I don't know what time it is."

"We are not made by our circumstances, we are made by our choices."

"Life is made up of sobs, sniffles, and smiles, with sniffles predominating."

"A stitch in time may have ten times the sequel."