II. The Christian life is to be not merely a continual getting rid of evil, but a continual becoming good.
Paul here draws a distinction between cleansing ourselves from filthiness and perfecting holiness, and these two, though closely connected and capable of being regarded as being but the positive and negative sides of one process, are in reality different, though in practice the former is never achieved without the latter, nor the latter accomplished without the former. Holiness is more than purity; it is consecration. That is holy which is devoted to God, and a saint is one whose daily effort is to devote his whole self, in all his faculties and nature, thoughts, heart, and will, more and more, to God, and to receive into himself more and more of God.
The purifying which Paul has been enjoining will only be successful in the measure of our consecration, and the consecration will only be genuine in the measure of our purifying. Herein lies the broad and blessed distinction between the world's morality and Christian ethics. The former fails just because it lacks the attitude towards a Person who is the very foundation of Christian morality, and changes a hard and impossible law into love. There is no more futile waste of breath than that of teachers of morality who have no message but Be good! Be good! and no motive by which to urge it but the pleasures of virtue and the disadvantages of vice, but when the vagueness of the abstract thought of goodness solidifies into a living Person and that Person makes his appeal first to our hearts and bids us love him, and then opens before us the unstained light of his own character and beseeches us to be like him, the repellent becomes attractive: the impossible becomes possible, and 'if ye love Me keep My commandments' becomes a constraining power and a victorious impulse in our lives.
III. The Christian life of purifying and consecration is to be animated by hope and fear.
The Apostle seems to connect hope more immediately with the cleansing, and holiness with the fear of God, but probably both hope and fear are in his mind as the double foundation on which both purity and consecration are to rest, or the double emotion which is to produce them both. These promises refer directly to the immediately preceding words, 'I will be a Father unto you and ye shall be My sons and daughters,' in which all the blessings which God can give or men can receive are fused together in one lustrous and all-comprehensive whole. So all the great truths of the Gospel and all the blessed emotions of sonship which can spring up in a human heart are intended to find their practical result in holy and pure living. For this end God has spoken to us out of the thick darkness; for this end Christ has come into our darkness; for this end He has lived; for this end He died; for this end He rose again; for this end He sends His Spirit and administers the providence of the world. The purpose of all the Divine activity as regards us men is not merely to make us happy, but to make us happy in order that we may be good. He whom what he calls his religion has only saved from the wrath of God and the fear of hell has not learned the alphabet of religion. Unless God's promises evoke men's goodness it will be of little avail that they seem to quicken their hope. Joyful confidence in our sonship is only warranted in the measure in which we are like our Father. Hope often deludes and makes men dreamy and unpractical. It generally paints pictures far lovelier than the realities, and without any of their shadows; it is too often the stimulus and ally of ignoble lives, and seldom stirs to heroism or endurance, but its many defects are not due to itself but to its false choice of objects on which to fix. The hope which is lifted from trailing along the earth and twining round creatures and which rises to grasp these promises ought to be, and in the measure of its reality is the ally of all patient endurance and noble self-sacrifice. Its vision of coming good is all directed to the coming Christ, and 'every man that hath this hope in Him, purifieth himself even as He is pure.'