Who said "I do my best even when my best is shaking in my boots."?

This quote is attributed to Courage the Cowardly Dog.

I do my best even when my best is shaking in my boots. - Courage the Cowardly Dog

"I do my best even when my best is shaking in my boots."

Courage the Cowardly Dog Motivation

"Courage, the cowardly dog."

"What's wrong, Muriel?"

"Oh, the things I do for love."

"Stupid Eustace!"

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."