Who is weak. How many there are that allow all offenses to pass by unheeded -- who either despise the infirmities of brethren, or trample them under foot! This, however, arises from their having no concern for the Church. For concern, undoubtedly, produces sumpatheian (sympathy,) [1] which leads the Minister of Christ to participate in the feelings of all, [2] and put himself in the place of all, that he may suit himself to all.

Footnotes

1 - See Calvin's Harmony, [64]vol. 2, p. 232.

2 - "Prend en soy les afflictions de tous;" -- "Take upon himself the afflictions of all."

Who is weak - I sympathize with all. I feel where others feel, and their sorrows excite deep sympathetic emotions in my bosom. Like a tender and compassionate friend I am affected when I see others in circumstances of distress. The word "weak" here may refer to any lack of strength, any infirmity or feebleness arising either from body or mind. It may include all who were feeble by persecution or by disease; or it may refer to the weak in faith and doubtful about their duty (see 1-Corinthians 9:22), and to those who were burdened with mental sorrows. The idea is, that Paul had a deep sympathy in all who needed such sympathy from any cause. And the statement here shows the depth of feeling of this great apostle; and shows what should be the feeling of every pastor; see the note on Romans 12:15.
And I am not weak? - I share his feelings and sympathize with him. If he suffers, I suffer. Bloomfield supposes that Paul means that in the case of those who were weak in the faith he accommodated himself to their weakness and thus became all things to all people; see my note on 1-Corinthians 9:22. But it seems to me probable that he uses the phrase here in a more general sense, as denoting that he sympathized with those who were weak and feeble in all their circumstances.
Who is offended - (σκανδαλίζεται skandalizetai). Who is "scandalized." The word means properly to cause to stumble and fall; hence, to be a stumbling-block to any one; to give or cause offence to anyone. The idea here seems to be, "who is liable to be led astray; who has temptations and trials that are likely to lead him to sin or to cause him to fall, and I do not burn with impatience to restore him, or with indignation against the tempter?" In all such cases Paul deeply sympathized with them, and was prompt to aid them.
And I burn not? - That is, with anger or with great agitation of mind at learning that anyone had fallen into sin. This may either mean that he would burn with indignation against those who had led them into sin, or be deeply excited in view of the disgrace which would be thus brought on the Christian cause. In either case it means that his mind would be in a glow of emotion; he would feel deeply; he could not look upon such things with indifference or without being deeply agitated. With all he sympathized; and the condition of all, whether in a state of feeble faith, or feeble body, or falling into sin, excited the deepest emotions in his mind. The truth here taught is, that Paul felt a deep sympathy for all others who bore the Christian name, and this sympathy for others greatly increased the cares and toils of the apostolic office which he sustained. But having given this exposition, candor compels me to acknowledge that the whole verse may mean, "Who is feeble in the faith in regard to certain observances and rites and customs 1-Corinthians 9:22, and I do not also evince the same? I do not rouse their prejudices, or wound their feelings, or alarm them. On the other hand, who is scandalized, or led into sin by the example of others in regard to such custom; who is led by the example of others into transgression, and I do not burn with indignation?" In either case, however, the general sense is, that he sympathized with all others.

Who is weak - What Church is there under persecution, with which I do not immediately sympathize? or who, from his weakness in the faith, and scrupulousness of conscience, is likely to be stumbled, or turned out of the way, to whom I do not condescend, and whose burden I do not bear?
Who is offended - Or likely to be turned out of the way, and I burn not with zeal to restore and confirm him? This seems to be the sense of these different questions.

Who is weak, and I am not weak.... What church is so? or what particular believer is so? for he had not only the care of all the churches, but of all believers upon him; whoever was weak in the faith he was concerned for them, to instruct, establish, and strengthen them; and suited his discourses, reasonings, and language, to their capacity, that they might understand him, and take in right notions of things: or whoever was of a weak and scrupulous conscience about things indifferent, and fearful of using them lest they should sin in so doing, he was cautious of offending them, or doing anything by which their consciences should be defiled, and their peace be broken: or whoever was afflicted, either in body or mind, he sympathized and bore a part with them:
who is offended, and I burn not? whoever was stumbled and made to fall by anything he said or did, or by the words and actions of others, it gave him sensible pain, it made him very uneasy; he was as one in a flame, all on fire, full of grief and trouble till the cause of the offence was removed, and the person offended made easy and restored; the word here used answers to the Hebrew word used in Job 30:25 where it is said, "was not my soul grieved for the poor?" which Mr. Broughton renders, "did not my soul burn for the poor?" Now by all this which the apostle did and suffered, by all actions and sufferings, care and sympathy, he fully appeared to be a true and faithful minister of Christ, and abundantly more than the false apostles, who could produce none of these things as testimonies in their favour.

I . . . weak--in condescending sympathy with the weak (1-Corinthians 9:22). "Care generates sympathy, which causes the minister of Christ personally to enter into the feelings of all his people, as if he stood in their position, so as to accommodate himself to all" [CALVIN].
offended--by some stumbling-block put in his way by others: the "weak" is most liable to be "offended."
I burn not--The "I" in the Greek is emphatic, which it is not in the former clause, "I am not weak." I not only enter into the feeling of the party offended, but I burn with indignation at the offender, I myself taking up his cause as my own. "Who meets with a stumbling-block and I am not disturbed even more than himself" [NEANDER].

Who - So he had not only the care of the churches, but of every person therein. Is weak, and I am not weak - By sympathy, as well as by condescension. Who is offended - Hindered in, or turned out of, the good way. And I burn not - Being pained as though I had fire in my bosom.