It is good neither to eat flesh, etc. - The spirit and self-denying principles of the Gospel teach us, that we should not only avoid every thing in eating or drinking which may be an occasion of offense or apostasy to our brethren, but even to lay down our lives for them should it be necessary.

Whereby thy brother stumbleth - Προσκοπτει, from προς, against, and κοπτω, to strike, to hit the foot against a stone in walking, so as to halt, and be impeded in one's journey. It here means, spiritually, any thing by which a man is so perplexed in his mind as to be prevented from making due progress in the Divine life. Any thing by which he is caused to halt, to be undecisive, and undetermined; and under such an influence no man has ever yet grown in grace and in the knowledge of Jesus Christ.

Or is offended - Η σκανδαλιζεται, from σκανδαλον, a stumbling-block; any thing by which a person is caused to fall, especially into a snare, trap, or gin. Originally the word signified the piece of wood or key in a trap, which being trodden on caused the animal to fall into a pit, or the trap to close upon him. In the New Testament it generally refers to total apostasy from the Christian religion; and this appears to be its meaning in this place.

Or is made weak - Η ασθενει, from α, negative, and σθενος, strength; without mental vigor; without power sufficiently to distinguish between right and wrong, good and evil, lawful and unlawful. To get under the dominion of an erroneous conscience, so as to judge that to be evil or unlawful which is not so. The two last terms are omitted by two excellent MSS. (the Codex Alexandrinus and the Codex Ephraim), by the Syriac of Erpen, the Coptic and the Ethiopic, and by some of the primitive fathers. It is very likely that they were added by some early hand by way of illustration. Griesbach has left them in the text with a note of doubtfulness.

good.

Romans 14:17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.

Romans 15:1,2 We then that are strong ought to bear the infirmities of the weak, and not to please ourselves...

1 Corinthians 8:13 Why, if meat make my brother to offend, I will eat no flesh while the world stands, lest I make my brother to offend.

whereby.

Romans 14:13 Let us not therefore judge one another any more: but judge this rather...

Malachi 2:8 But you are departed out of the way; you have caused many to stumble at the law; you have corrupted the covenant of Levi...

Matthew 16:23 But he turned, and said to Peter, Get you behind me, Satan: you are an offense to me: for you mind not the things that be of God...

Matthew 18:7-10 Woe to the world because of offenses! for it must needs be that offenses come; but woe to that man by whom the offense comes!...

Luke 17:1,2 Then said he to the disciples, It is impossible but that offenses will come: but woe to him, through whom they come!...

Philippians 1:10 That you may approve things that are excellent; that you may be sincere and without offense till the day of Christ.

Hebrews 12:13 And make straight paths for your feet, lest that which is lame be turned out of the way; but let it rather be healed.

Revelation 2:14 But I have a few things against you, because you have there them that hold the doctrine of Balaam...

The Limits of Liberty
'So then every one of us shall give account of himself to God. 13. Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock, or an occasion to fall, in his brother's way. 14. I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth anything to be unclean, to him it is unclean. 15. But if thy brother be grieved with thy meat, now walkest thou not charitably. Destroy not him with thy meat, for whom …
Alexander Maclaren—Romans, Corinthians (To II Corinthians, Chap. V)

A Summary of the Christian Life. Of Self-Denial.
The divisions of the chapter are,--I. The rule which permits us not to go astray in the study of righteousness, requires two things, viz., that man, abandoning his own will, devote himself entirely to the service of God; whence it follows, that we must seek not our own things, but the things of God, sec. 1, 2. II. A description of this renovation or Christian life taken from the Epistle to Titus, and accurately explained under certain special heads, sec. 3 to end. 1. ALTHOUGH the Law of God contains …
Archpriest John Iliytch Sergieff—On the Christian Life

Further Journeying About Galilee.
^C Luke VIII. 1-3. ^c 1 And it came to pass soon afterwards [ i. e.,. soon after his visit to the Pharisee], that he went about through cities and villages [thus making a thorough circuit of the region of Galilee], preaching and bringing the good tidings of the kingdom of God [John had preached repentance as a preparation for the kingdom; but Jesus now appears to have preached the kingdom itself, which was indeed to bring good tidings--Rom. xiv. 17 ], and with him the twelve [We here get a glimpse …
J. W. McGarvey—The Four-Fold Gospel