Live for God but not for Yourself
The basic principle is that this universe was created by God for Himself but not for mankind.
But God also created human beings for Himself. Therefore, men should make full efforts to satisfy God but not themselves.
So, a big question remains: why did God have to create the universe and human beings for Himself? The clue to this question can be only found in the holy books and especially in the words of Christ Jesus.
Christ Jesus said to accumulate wealth in Heaven but not in this world where wealth gets rotten. Therefore, we may suppose that God created the universe and human beings to increase wealth in Heaven. When a man lives a righteous life and does good deeds, helping the poor and saving the weak, his wealth should be created in Heaven. Angels in Heaven should be glad to see such wealth increasing.
But if a man does not contribute to increasing wealth in Heaven while making himself rich in this world, he should be surely condemned and thrown into the hell. Accordingly, we can simply understand that rich men are bad and evil and poor men are blessed no matter how difficult their lives are in this material world.
Poor men are destined for Heaven. But if rich and evil men become so influential and powerful, making poor people suffer gravely, it is natural that God should interfere with the human world. That is why Christ Jesus appeared in this world 2000 years ago. However, as God is almighty, He must have known from the beginning that mankind would fail unless God interferes. So, Christ Jesus came to this world at the right time and would come again at the very right time. And, watching the global situations, we had better think that Christ Jesus has already come to the human world again.
Indeed, today only a very few people think that they have to live for God since God is the Creator of all that exists.
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Luk 7:17 And this rumour of him went forth throughout all Judaea, and throughout all the region round about.