Exodus 21 is just telling us, never to hire a hireling or a servant unless you can afford to take care of him or her for life, and can afford to take care of the hireling/servants mate and offspring for life.
The world is run by the devil.
Matt 5:8-9 The devil took Jesus to a high mountain and showed and offered to give Jesus all the kingdoms of the world; 9 If Jesus would fall down and worship the devil
Matt 5:10 Jesus said to satan, Get thee hence satan, thou shall worship God and serve only God.
Matt 5:11 Then the devil left and, behold, angels came and ministered unto Jesus.
To pray without ceasing is to live in Gods world on earth, be in continual communication with God and be in Gods word, and not in the devils world under the devil.To be in the world yet not of the world. John 17:16 They are not of the world, even as I am not of the world. I John 2:15-17 Love not the world.....if any man loves the world he does not love God...for all that is in the world is the lust of the flesh, lust of the eyes and the pride of life, is not of God, but is of the world.