Look at this obvious fact. So-and-so is perfectly sure he 'belongs to Christ'? Well then, let him understand, on second thoughts, that I 'belong to Christ' as much as he does.
If your brother is being injured because you eat a certain food, then you are no longer living by the rule of love. Do not let that food of yours ruin the man for whom Christ died.
But you are not in the flesh, you are in the Spirit, since the Spirit of God dwells within you. Anyone who does not possess the Spirit of Christ does not belong to Him.