While we have opportunity. The metaphor is still pursued. Every season is not adapted to tillage and sowing. Active and prudent husbandmen will observe the proper season, and will not indolently allow it to pass unimproved. Since, therefore, God has set apart the whole of the present life for ploughing and sowing, let us avail ourselves of the season, lest, through our negligence, it may be taken out of our power. Beginning with liberality to ministers of the gospel, Paul now makes a wider application of his doctrine, and exhorts us to do good to all men, but recommends to our particular regard the household of faith, or believers, because they belong to the same family with ourselves. This similitude is intended to excite us to that kind of communication which ought to be maintained among the members of one family. There are duties which we owe to all men arising out of a common nature; but the tie of a more sacred relationship, established by God himself, binds us to believers.

As we have therefore opportunity, let us do good unto all men - This is the true rule about doing good. "The opportunity to do good," said Cotton Mather, "imposes the obligation to do it." The simple rule is, that we are favored with the opportunity, and that we have the power. It is not that we are to do it when it is convenient; or when it will advance the interest of a party; or when it may contribute to our fame; the rule is, that we are to do it when we have the opportunity. No matter how often that occurs; no matter how many objects of benevolence are presented - the more the better; no matter how much self-denial it may cost us; no matter how little fame we may get by it; still, if we have the opportunity to do good, we are to do it, and should be thankful for the privilege. And it is to be done to all people. Not to our family only; not to our party; not to our neighbors; not to those of our own color; not to those who live in the same land with us, but to all mankind. If we can reach and benefit a man who lives on the other side of the globe, whom we have never seen, and shall never see in this world or in the world to come, still we are to do him good. Such is Christianity. And in this, as in all other respects, it differs from the narrow and selfish spirit of clanship which prevails all over the world.
Especially - On the same principle that a man is bound particularly to benefit his own family and friends. In his large and expansive zeal for the world at large, he is not to forget or neglect them. He is to feel that they have special claims on him. They are near him. They are bound to him by tender ties. They may be particularly dependent on him. Christianity does not relax the ties which bind us to our country, our family, and our friends. It makes them more close and tender, and excites us more faithfully to discharge the duties which grow out of these relations. But, in addition to that, it excites us to do good to all people, and to bless the stranger as well as the friend; the man who has a different color from our own, as well as he who has the same; the man who lives in another clime, as well as he who was born in the same country in which we live.
Of the household of faith - Christians are distinguished from other people primarily by their believing the gospel, and by its influence on their lives.

As we have - opportunity - While it is the time of sowing let us sow the good seed; and let our love be, as the love of Christ is, free, manifested to all. Let us help all who need help according to the uttermost of our power; but let the first objects of our regards be those who are of the household of faith - the members of the Church of Christ, who form one family, of which Jesus Christ is the head. Those have the first claims on our attention, but all others have their claims also, and therefore we should do good unto all.

(8) As we have therefore opportunity, let us do good unto all [men], especially unto them who are of the household of faith.
(8) Those that are of the household of faith, that is, those who are joined with us in the profession of one self same religion, ought to be preferred before all others, yet in such a way that our generosity extends to all.

As we have therefore opportunity,.... Or "ability", so the phrase is sometimes used (z); as occasion requires, objects offer, as there is ability of well doing, and that continues; while the time of life lasts, which is the time for sowing, or doing good works:
let us do good unto all men; not only to our relations, friends, and acquaintance, but to all men; to them that are strangers to us, of whatsoever nation, Jew or Gentile; and of whatsoever religion or sect, yea, even to our very enemies:
especially unto them who are of the household of faith: the children of God, that belong to his family, are true believers in Christ, hold the doctrine of faith, make a profession of it, and keep it fast; these are more especially to be the objects of Christian beneficence and liberality. The apostle may have sense reference to a practice among the Jews, who took a particular care of the children of good men that were poor;
"there were two chambers in the temple, the one was called the chamber of secrets, and the other the chamber of vessels: into the chamber of secrets, religious men used to put privately, whereby were privately maintained the poor , "of the children of good men" (a).''
The Targumist on Jeremiah 5:3 has a phrase much like to this applied to God, paraphrasing the passage thus; is it not, O Lord, revealed before thee, , "to do good to the servants of faith?"
(z) See Hammond on. Phil. iv. 10. (a) Misn. Shekalim, c. 5. sect. 6.

Translate, "So then, according as (that is, in proportion as) we have season (that is, opportunity), let us work (a distinct Greek verb from that for "do," in Galatians 6:9) that which is (in each case) good." As thou art able, and while thou art able, and when thou art able (Ecclesiastes 9:10). We have now the "season" for sowing, as also there will be hereafter the "due season" (Galatians 6:9) for reaping. The whole life is, in one sense, the "seasonable opportunity" to us: and, in a narrower sense, there occur in it more especially convenient seasons. The latter are sometimes lost in looking for still more convenient seasons (Acts 24:25). We shall not always have the opportunity "we have" now. Satan is sharpened to the greater zeal in injuring us, by the shortness of his time (Revelation 12:12). Let us be sharpened to the greater zeal in well-doing by the shortness of ours.
them who are of the household--Every right-minded man does well to the members of his own family (1-Timothy 5:8); so believers are to do to those of the household of faith, that is, those whom faith has made members of "the household of God" (Ephesians 2:19): "the house of God" (1-Timothy 3:15; 1-Peter 4:17).

Therefore as we have opportunity - At whatever time or place, and in whatever manner we can. The opportunity in general is our lifetime; but there are also many particular opportunities. Satan is quickened in doing hurt, by the shortness of the time, Revelation 12:12. By the same consideration let us be quickened in doing good. Let us do good - In every possible kind, and in every possible degree. Unto all men - Neighbours or strangers, good or evil, friends or enemies. But especially to them who are of the household of faith. For all believers are but one family.