Who said "Patient endurance is the mark of true character."?

This quote is attributed to Rubén Darío.

Patient endurance is the mark of true character. - Rubén Darío

"Patient endurance is the mark of true character."

Rubén Darío Patience

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"

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."