Judgement Day must come. Allah gives life and causes death, so be prepared for death. Do not dispute His Signs rather learn lessons from them and from the history of past peoples. This Sura tells that Faith and Revelation is Allah's Power and Goodness' Belief in Allah and His Revelation will be to man's benefit. He will then do righteous deeds.
Revelation explains things in detail.
It gives good news to the doers of Good and warns men against doing Evil. Do not Deny His Existence or His Message, because the knowledge of both can be found by studying His Creation. Learn from the stories of the 'Ad and Thamud. They were destroyed for their disbelief. The true man of Faith calls others to share the beauty of his Faith.