'Eternal' in the Bible

For our momentary light affliction is producing in us an eternal weight of glory {beyond all measure and proportion},

[because] we are not looking at what is seen, but what is not seen. For what is seen [is] temporary, but what is not seen [is] eternal.

For we know that if our earthly house, the tent, is destroyed, we have a building from God, a house not made by hands, eternal in the heavens.