Paul’s description of the enemies of the cross suggests that they were controlled by their bellies. Paul may have meant something other than appetite when he used the word belly, but there can be no doubt that the idea is included. In Romans 16:18, Paul said that “they that are such serve not our Lord Jesus Christ, but their own belly.” In other words, those who are divisive and doctrinally unsound are led by their own lusts. The outcomes of their desires focus upon fulfilling their own lusts which Proverbs and Ecclesiastes reinforce. In Proverbs 16:26, the Bible says that man “laboureth for himself; for his mouth craveth it of him.” This is repeated in Ecclesiastes 6:7 where the Bible says, “All the labour of man is for his mouth, and yet the appetite is not filled.” These are just a few biblical examples of those ruled by appetite.
Paul and Barnabas admonished the heathen to turn from “vanities unto the living God.” One cannot trust in the Lord and simultaneously trust in anything else. In order for an individual to be saved, he must repent of trusting in anything other than the Lord. One aspect of repentance involves ceasing to trust vanity and turning one’s faith toward the living and true God. This saving faith needs to become a living faith following salvation. Believers should consistently turn from “vain thoughts” and love the law of God (Psalm 119:113). They should turn from the vain labours that spend their strength for nought (Isaiah 49:4) and be “steadfast . . . in the work of the Lord” knowing that their “labour is not in vain in the Lord” (1 Corinthians 15:58). Additionally, believers should turn from “vain words” (Ephesians 5:6) and hold “forth the word of life” (Philippians 2:16).
