Who said "Strength is not physical, but of character and will."?

This quote is attributed to O. Henry.

Strength is not physical, but of character and will. - O. Henry

"Strength is not physical, but of character and will."

O. Henry Strength

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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."