And I know that his commandment is life everlasting,.... By "his commandment" is not meant the law; that indeed is often styled the commandment; and it is the commandment of God; and many excellent things are said of it; and among the rest it is called "life", De 30:15, but not everlasting life: it only promised a continuation of natural life to man, on condition of obedience to it; more than this it did not promise to Adam, in innocence; and what it promised to the obedient Israelites, was only a prolongation of natural life in the land which God gave unto them: but it neither promises, nor gives spiritual life to the fallen sons of Adam; it leaves men as it finds them, dead in trespasses and sins; and cannot communicate either a life of sanctification, or of justification to them; nor does it so much as give them any hopes of life, or show where it is to be had; nor is everlasting life to be obtained by the works of it: justification is not by the works of the law; nor salvation by works of righteousness done by men; and consequently eternal life is never to be attained unto by obedience to the commands of the law: it is so far from being in this sense life everlasting, that it is the ministration of condemnation and death.
But the Gospel is here meant, and is called a commandment; not that it has the nature of a law, or consists of precepts, as the law does; but because it is by the commandment of the everlasting God published by Christ, and his apostles.
Christ, as appears from the preceding verse, had a commandment from his Father, what he should say and speak; now, not the doctrine he delivered was the commandment itself, but it was a commandment of the Father that he should deliver that doctrine; besides, the word "commandment" sometimes signifies no other than a doctrine, as in Ps 19:8; and the sense is, that the doctrine of the Gospel, which Christ had in commission from the Father to preach, is life everlasting; and is so called, because it is a means of quickening sinners with a spiritual life, which issues in an eternal one; it is the savour of life unto life, and the Spirit which giveth life, and is the ministration of it; and it is a means of implanting the graces of the Spirit of God in the heart, which sprung up unto everlasting life; and of bringing souls to the knowledge of Christ, which is the beginning, pledge, and earnest of eternal life: and besides all this, it gives an account of the nature of eternal life; it directs the way unto it, which is by Christ, and describes the persons who shall enjoy it; showing, that their title to it is the righteousness of Christ, and their meetness for it the regenerating grace of the Spirit; and that all that believe in Christ shall have it:whatsoever I speak therefore, even as the Father said unto me so I speak; and no otherwise, and therefore ought to be received, and not rejected.
This is to be understood not of what Christ spoke in common conversation, but in the ministry of the word, even of the doctrines of the Gospel, which were given him by his Father, and which he knew were agreeable to his mind and will, and to his council and covenant, and to everything done and agreed therein, to which he was privy: these he delivered as he received them, and both as to matter and manner, as it was his Father's will and pleasure he should: he preached the righteousness of God, and hid it not; he declared his faithfulness, and his salvation, and concealed not his lovingkindness and truth, Ps 40:9.
Now, though it is a sufficient ground of faith to receive and believe the doctrines of the Gospel, because Christ has spoken them, who is truth itself; yet it is a further confirmation of them, that they are what his Father, the God of truth, said unto him: and his delivering them as he had them from him, is an instance of his faithfulness to him that sent him; and should be imitated by his ministers, who ought to declare the whole counsel of God, and keep back nothing they have received from Christ, and which may be profitable to the souls of men.