Theophylact of Ohrid — on Rom 14:3 (Commentary on Romans)

“Those who ate everything, being perfect, looked down on those who did not eat, as people of little faith still attached to Judaism. On the other hand, those who did not eat condemned those who ate everything as lacking self-control. Since among them many were from the Gentiles, he says: "God has accepted him," that is, He showed him His ineffable grace. Why then do you argue with him about the law, when Christ has justified him?”