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.
(..) and let thine eye look like a friend on Denmark Do not forever with thy veiled lids seek for thy father in the dust Thou knowst 'tis common all that lives must die, passing through nature to eternity - Aye madam, it is common - If it be, why seems it so particular with thee? 'Seems' madam? (..)2015 Hamlet