She promised to love him for all 'eternity'. [=to love him forever]
We suffered through an 'eternity' of delays during the lawsuit.
They believed that sinners would spend 'eternity' in hell.
(..) do not be troubled. For you are in Elysium, and you're already dead! Brothers, what we do in life... echoes in eternity. - Pull! Pull! Pull! Catapults ready, sir! Archers, ignite! - Ignite! (..)2000 Gladiator