Who said "Strength comes not from muscles, but from character."?

This quote is attributed to Irwin.

Strength comes not from muscles, but from character. - Irwin

"Strength comes not from muscles, but from character."

Irwin Strength

"Nergal's my best friend!"

"I'm a little Jewish boy with a big heart!"

"Gee, that's swell!"

"I love my mommy and daddy!"

"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."