Who said "Sometimes a man must stand alone, but not for long."?

This quote is attributed to Boromir.

Sometimes a man must stand alone, but not for long. - Boromir

"Sometimes a man must stand alone, but not for long."

Boromir Solitude

"A day may come when the courage of men fails, but it is not this day!"

"One does not simply walk into Mordor without great strength of will."

"The Ring cannot stay in the Shire. It is a gift, a tool for those who would use it wisely."

"I would see the glory of Gondor restored before all else."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."