'Eternal' in the Bible

For this our light and transitory burden of suffering is achieving for us a preponderating, yes, a vastly preponderating, and eternal weight of glory;

while we look not at things seen, but things unseen; for things seen are temporary, but things unseen are eternal.

For we know that if this poor tent, our earthly house, is taken down, we have in Heaven a building which God has provided, a house not built by human hands, but eternal.