Paul knows how to be humble, that is, deprived of the basic needs of life; He also knows how to become rich, that is, to get more than what he needed at that time. Whether full or hungry, surplus or lack, he got all the secrets. How did the Apostle Paul learn this lesson? As long as: he is convinced that he is in the will of God. He knows that no matter where he is, or under what circumstances, it is arranged by God. If he is hungry, it is because God wants him to be hungry. If he is full, it is because of the Lord's plan. He is busy serving his king faithfully. He can say, "Father, even so, because it is good in your eyes."