A slave who had been freed would not want to go back to a cruel master who had treated him badly all his life. He would want to keep as far away from such a master as he possibly could. The strange thing about some Christians is that after the Lord Jesus Christ has bought them away from their old master, sin, at such a great and awful price, they seem to want to go back to him and leave the Lord Jesus. That does not seem possible, does it?
In verses 4-22 Jesus answers the disciples' questions. The first part of Jesus’ answer has to do with many bad things that will happen but which are not in themselves signs of the end. He lists these in verses 4-14, then gives a particularly terrible example of such a bad thing in verses 15-22.