Who said "Strength is the ability to endure more suffering."?

This quote is attributed to Droopy.

Strength is the ability to endure more suffering. - Droopy

"Strength is the ability to endure more suffering."

Droopy Strength

"I'm so happy."

"Hello, I'm so glad to see you."

"That makes me so sad."

"I'm afraid I have some bad news."

"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."