Consider your own progress: do you want to go backwards

^8-11 At one time when you had no knowledge of God, you were under the authority of gods who had no real existence. But now that you have come to know God, or rather are known by him, how can you revert to dead and sterile principles and consent to be under their power all over again? Your religion is beginning to be a matter of observing certain days or months or seasons or years. Frankly, you stagger me, you make me wonder if all my efforts over you have been wasted!