Galatians 4:6-10

Because you are sons, God has sent the Spirit of His Son into our hearts, crying out, “Abba! Father!”

Therefore you are no longer a slave, but a son; and if a son, then an heir through God.

However at that time, when you did not know God, you were slaves to those which by nature are not gods.

But now that you have come to know God, or rather to be known by God, how is it that you turn back again to the weak and worthless elementary principles, to which you want to be enslaved all over again?

You meticulously observe days and months and seasons and years.