Who said "The struggle within oneself is the only true struggle."?

This quote is attributed to Knut Hamsun.

The struggle within oneself is the only true struggle. - Knut Hamsun

"The struggle within oneself is the only true struggle."

Knut Hamsun Courage

Novelist Norwegian 1859–1952

"I love the beautiful season when the fruits fall from the trees like rain."

"A man can do what he wills, but he cannot will what he wills."

"The human heart is like a ship on a stormy sea driven about by winds blowing from all four corners of heaven."

"I have committed the great crime of not being ambitious."

"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."