Noah was warned by God about things that he could not yet see. But he had faith and respect for God, so he built a large boat to save his family. With his faith, Noah showed that the world was wrong. And he became one of those who are made right with God through faith.
These two things cannot change: God cannot lie when he says something, and he cannot lie when he makes an oath. So these two things are a great help to us who have come to God for safety. They encourage us to hold on to the hope that is ours.