Jamieson, Fausset and Brown on Galatians 6:10

10. 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 Ga 6:9) that which is (in each case) good." As thou art able, and while thou art able, and when thou art able (Ec 9:10). We have now the "season" for sowing, as also there will be hereafter the "due season" (Ga 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 (Ac 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 (Re 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 (1Ti 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" (Ep 2:19): "the house of God" (1Ti 3:15; 1Pe 4:17).