Now to the Apostle who had this cause of gladness in the past, there opened (ver. 6) a gladdening prospect for the future, which at once deepened his thankfulness and gave expectancy to his prayers. "Being confident of this very thing, that He that hath begun a good work in you will perform it unto the day of Jesus Christ." "Being confident of this very thing" is equivalent to "Having no less confidence than this"; for he desires to express that his confidence is emphatic and great.
The confidence so expressed assumes a principle, and makes application of that principle to the Philippian saints.
The principle is that the work of saving grace clearly begun by the Spirit of God shall not be destroyed and come to nothing, but shall be carried on to complete salvation. This principle is not received by all Christians as part of the teaching of Scripture; but without entering now into any large discussion, it may be pointed out that it seems to be recognised, not merely in a few, but in many passages of Holy Writ. Not to recite Old Testament indications, we have our Lord's word (John x. 28): "I give unto them eternal life, and they shall never perish, neither shall any man pluck them out of My hand." And there is hardly an Epistle of our Apostle in which the same principle is not presented to us, stated in express terms, or assumed in stating other doctrines, and applied to the comfort of believers (1 Thess. v. 23, 24; 1 Cor. i. 8; Rom. viii. 30). The ultimate salvation of those in whom a good work is begun, is, in this view, conceived to be connected with the stability of God's purposes, the efficacy of the Son's mediation, the permanence and power of the Holy Spirit's influence, and the nature of the covenant under which believers are placed. And the perseverance thus provided for is supposed to be made good through the faith, patience, fear, and diligence of those who persevere, and by no means without these. As to the place before us, whatever exceptions and whatever distinctions may be taken on the subject, it must be owned that, gladly recognising Christian character and attainment as a fact, he finds therein a warrant for emphatic confidence about the future, even to the day of Christ.
As to the application of this principle to the Philippians, the method in which the Apostle proceeds is plain. He certainly does not speak as by immediate insight into Divine counsels about the Philippians. He is directed to utter a conclusion at which he had arrived by a process which he explains. From the evidence of the reality of their Christian calling, he drew the conclusion that Christ was at work in them, and the further conclusion that this work would be completed. It may be asked how so confident an application of the principle now in view could be reached on these terms? How could the Apostle be sure enough of the inward state of his Philippian friends, to enable him to reason on it, as here he seems to do? In answer, we grant it to be impossible for any one, without immediate revelation on the point, to reach absolute assurance about the spiritual state of other people. And therefore we are to keep in view, what has already been suggested, that the Apostle, speaking to "saints," really remits to themselves and to their Lord the final question as to the reality of that apparent saintship. But then, we are taught by the Apostle's example that where ordinary tokens, and especially where more than ordinary tokens of Christian character appear, we are frankly and gladly to give effect to those signs in our practical judgments. There may be an error, no doubt there is, in unbounded charity; but there is error also when we make a grudging estimate of Christian brethren; when, on the ground of some failing, we allow suspicion to obliterate the impressions which their Christian faith and service might fairly have made upon us. We are to cherish the thought that a wonderful future is before those in whom Christ is carrying on His work of grace; and we are to make a loving application of that hope in the case of those whose Christian dispositions have become specially manifest to us in the intercourse of Christian friendship.