Who said "We must be cautious, for dark things stir in the world."?

This quote is attributed to Boromir.

We must be cautious, for dark things stir in the world. - Boromir

"We must be cautious, for dark things stir in the world."

Boromir Fear

"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."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."