Romans 14:16

By their "good," he means here either their faith, or the hope of rewards hereafter, or the perfectness of their religious state. For it is not only that you fail to profit your brother, he means, but the doctrine itself, and the grace of God, and His gift, you cause to be evil spoken of. Now when thou fightest, when thou quarrellest, when thou art vexatious, when thou makest schism in the Church, and reproachest thy brother, and art distant with him, those that are without will speak evil of you. And so good is so far from coming of this, that just the opposite is the case. For your good is charity, love of the brotherhood, being united, being bound together, living at peace, living in gentleness. He again, to put an end to his fears and the other's disputatiousness, says, "For the kingdom of God is not meat and drink." Is it by these, he means, that we are to be approved? As he says in another passage too, "Neither if we eat are we the better, neither if we eat not are we the worse." And he does not need any proof, but is content with stating it. And what he says is this, If thou eatest, does this lead thee to the Kingdom? And this was why, by way of satirizing them as mightily pleased with themselves herein, he said, not "meat" only, but "drink." What then are the things that do bring us here? "Righteousness, and peace, and joy," and a virtuous life, and peace with our brethren (whereto this quarrelsomeness is opposed), the joy from unanimity, which this rebuking puts an end to. But this he said not to one party only, but to both of them, it being a fit season for saying it to both. Then as he had mentioned peace and joy, but there is a peace and joy over bad actions also, he adds, "in the Holy Ghost." Since he that ruins his brother, hath at once subverted peace, and wronged joy, more grievously than he that plunders money. […]

That is, you have perfection in faith (for he called it "good"). Therefore do not abuse your perfection and do not give occasion for it to be blasphemed. For if you, being perfect, destroy the imperfect one, then you have given occasion to blaspheme the …

Then when he says, let not then, he presents the third reason, which is taken on the part of the gifts of spiritual grace. First, he shows what impropriety follows against such gifts from the fact that we place a stumbling block; second, he clarifies …

Let not then your good be evil spoken of.

Let not then your good ... - That which you esteem to be right, and which may be right in itself. You are not bound by the ceremonial law. You are free from the yoke of bondage This freedom you esteem to be a good - a favor - a high privilege. And so it is; but you should not make such a use of it as to do injury to others. Be evil spoken of - Greek, Be blasphemed. Do not so use your Christian liberty as to give occasion for railing and unkind remarks from your brethren, so as to produce contention and strife, and thus to give rise to evil reports among the wicked about the tendency of the Christian religion, as if it were adapted only to promote controversy. How much strife would have been avoided if all Christians had regarded this plain rule. In relation to dress, and rites, and ceremonies in the church, we may be conscious that we are right; but an obstinate adherence to them may only give rise to contention and angry discussions, and to evil reports among men, of the tendency of religion. In such a case we should yield our private, unimportant personal indulgence to the good of the cause of religion and of peace.