When Paul spoke of the flesh he referred to the sins of the flesh, as in Gal. 5:19-21. He added that "they which do such things shall not inherit the kingdom of God" The were going back to idolatry again, and he was afraid his labour had been in vain (Gal. 3:8-11). He told them to stand fast in liberty wherewith Christ had made them free, and stated that they were "fallen from grace" (Gal. 5:1-7). He plainly told them that "once in grace always in grace " was not true in their case.