Who said "Motivation comes not from outside, but from within."?

This quote is attributed to Rubén Darío.

Motivation comes not from outside, but from within. - Rubén Darío

"Motivation comes not from outside, but from within."

Rubén Darío Motivation

Poet Nicaraguan 1867–1916

"I am my own road"

"I seek the divine in all things"

"The poet is a light and a flame"

"To be a poet is to possess wings"

"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."