Galatians 4:9-11

Revised Standard Version Catholic Edition

⁹ but now that you have come to know God, or rather to be known by God, how can you turn back again to the weak and beggarly elemental spirits, whose slaves you want to be once more? ¹⁰ You observe days, and months, and seasons, and years! ¹¹ I am afraid I have labored over you in vain.