'Eternal' in the Bible

For our momentary and light affliction works for us in surpassing measure an eternal weight of glory;

while we look not at the things that are seen, but at the things that are not seen; for the things that are seen are for a time, but those that are not seen eternal.

For we know that if our earthly tabernacle house be destroyed, we have a building from God, a house not made with hands, eternal in the heavens.