Who said "Courage is a muscle we develop by using it."?

This quote is attributed to Marius Pontmercy.

Courage is a muscle we develop by using it. - Marius Pontmercy

"Courage is a muscle we develop by using it."

Marius Pontmercy Courage

Character in Les Misérables

Buy "Les Misérables" on Amazon

"Love is a terrible thing; it breaks us."

"To die is nothing; but it is terrible not to live."

"To be in love is to see yourself through someone else's eyes."

"To die for one's country is such a beautiful thing."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."