'Forever' in the Bible

A generation goes and a generation comes,but the earth remains forever.

I know that all God does will last forever; there is no adding to it or taking from it. God works so that people will be in awe of Him.

Even if a man fathers a hundred children and lives many years -- even if he lives a long, long time, but cannot enjoy his prosperity -- even if he were to live forever -- I would say, "A stillborn child is better off than he is!"

Also their love, their hatred, and their envy has perished long ago; neither have they any more a portion forever in anything that is done under the sun.