Day 4 teaches us that there is more to our lives than here and now, that we were made for forever meaning we were made to exist even after we leave this earth. We were made for eternity.
Day 5 teaches us that life is a test. Every test that you fail or pass helps develop your character, every tests helps you to be able to help someone else. Once you realize that life is a test you will realize that there is nothing insignificant in your life.
Day 6 teaches us that this life that we currently live is a temporary assignment going back to what was taught on day 4 that we were made for eternity.