For (or, and) the life was manifested The copulative is explanatory, as though he had said, "We testify of the vivifying Word, as life has been manifested." The sense may at the same time be twofold, that Christ, who is life and the fountain of life, has been manifested, or, that life has been openly offered to us in Christ. The latter, indeed, necessarily follows from the former. Yet as to the meaning, the two things differ, as cause and effect. When he repeats, We shew, or announce eternal life, he speaks, I have no doubt, of the effect, even that he announces that life is obtained for us in Christ. We hence learn, that when Christ is preached to us, the kingdom of heaven is opened to us, so that being raised from death we may live the life of God. Which was with the Father. This is true, not only from the time when the world was formed, but also from eternity, for he was always God, the fountain of life; and the power and the faculty of vivifying was possessed by his eternal wisdom: but he did not actually exercise it before the creation of the world, and from the time when God began to exhibit the Word, that power which before was hid, diffused itself over all created things. Some manifestation had already been made; the Apostle had another thing in view, that is, that life was then at length manifested in Christ, when he in our flesh completed the work of redemption. For though the fathers were even under the law associates and partakers of the same life, yet we know that they were shut up under the hope that was to be revealed. It was necessary for them to seek life from the death and resurrection of Christ; but the event was not only far remote from their eyes, but also hid from their minds. They depended, then, on the hope of revelation, which at length in due time followed. They could not, indeed, have obtained life, except it was in some way manifested to them; but the difference between us and them is, that we hold him already revealed as it were in our hands, whom they sought obscurely promised to them in types. But the object of the Apostle is, to remove the idea of novelty, which might have lessened the dignity of the Gospel; he therefore says, that life had not now at length began to be, though it had but lately appeared, for it was always with the Father.

For the life was manifested - Was made manifest or visible unto us. He who was the life was made known to people by the incarnation. He appeared among people so that they could see him and hear him. Though originally with God, and dwelling with him, John 1:1-2, yet he came forth and appeared among people. Compare the Romans 1:3 note; 1-Timothy 3:16 note. He is the great source of all life, and he appeared on the earth, and we had an opportunity of seeing and knowing what he was.
And we have seen it - This repetition, or turning over the thought, is designed to express the idea with emphasis, and is much in the manner of John. See John 1:1-3. He is particularly desirous of impressing on them the thought that he had been a personal witness of what the Saviour was, having had every opportunity of knowing it from long and familiar contact with him.
And bear witness - We testify in regard to it. John was satisfied that his own character was known to be such that credit would be given to what he said. He felt that he was known to be a man of truth, and hence he never doubts that faith would be put in all his statements. See John 19:35; John 21:24; Revelation 1:2; 3-John 1:12.
And shew unto you that eternal life - That is, we declare unto you what that life was - what was the nature and rank of him who was the life, and how he appeared when on earth. He here attributes eternity to the Son of God - implying that he had always been with the Father.
Which was with the Father - Always before the manifestation on the earth. See John 1:1. "The word was with God." This passage demonstrates the pre-existence of the Son of God, and proves that he was eternal. Before he was manifested on earth he had an existence to which the word life could be applied, and that was eternal. He is the Author of eternal life to us.
And was manifested unto us - In the flesh; as a man. He who was the life appeared unto people. The idea of John evidently is,
(1) that the Being here referred to was forever with God;
(2) that it was proper before the incarnation that the word life should be given to him as descriptive of his nature;
(3) that there was a manifestation of him who was thus called life, on earth; that he appeared among people; that he had a real existence here, and not a merely assumed appearance; and,
(4) that the true characteristics of this incarnate Being could be borne testimony to by those who had seen him, and who had been long with him. This second verse should be regarded as a parenthesis.

For the Life was manifested - The Lord Jesus, who is the creator of all things, and the fountain of life to all sentient and intellectual beings, and from whom eternal life and happiness come, was manifested in the flesh, and we have seen him, and in consequence bear witness to him as the fountain and author of eternal life; for he who was from eternity with the Father was manifested unto us his apostles, and to the whole of the Jewish nation, and preached that doctrine of eternal life which I have before delivered to the world in my gospel, and which I now farther confirm by this epistle.

(For the life was manifested, and we have seen [it], and bear witness, and (c) shew unto you that eternal life, which was with the Father, and was manifested unto us;)
(c) Being sent by him: and that doctrine is correctly said to be shown, for no man could so much as have thought of it, if it had not been thus shown.

For the life was manifested,.... That is, the Word of life, who is life itself, the fountain of life, having it as God, in and of himself, without derivation from, and independent of another, originally and eternally, and who is the cause, author, and giver of life in every sense to others; this living God, who from all eternity was invisible, was in the fulness of time manifested in human nature; see John 1:14.
And we have seen it; as before with the eyes of their bodies:
and bear witness; for they were both eye and ear witnesses of the Word, and of the truth of his incarnation, and bore a faithful record to his proper deity, and real humanity:
and show unto you that eternal life; Jesus Christ, the true God, and eternal life, as in 1-John 5:20; so called, because he has everlasting life in himself; as he is the living God, and because he has eternal life for all his people; not only the purpose and promise of it are in him, but the thing itself; and it is in his power and gift to bestow it on all the Father hath given to him, and to them he does give it. The beginning of it lies in the knowledge of him, and the consummation of it will be in the lasting vision and enjoyment of him:
which was with the Father; that is, which life, eternal life, and Word of life, was from the beginning, or from all eternity with God the Father; which phrase is expressive of the eternal existence of Christ, as the Word and Son of God, with his Father, his relation to him, his oneness in nature, and equality with him, and his personal distinction from him; see John 1:1;
and was manifested unto us; in human nature, as before observed, and that to the apostles, as he was not to the patriarchs and prophets; for though they saw him in promise, in prophecy, in type, and figure, and he sometimes appeared in an human form for a short time to them, yet they did not see him incarnate, in actual union with human nature; nor had they him dwelling among them, and conversing with them, as the apostles had; this was an happiness peculiar to them.

the life--Jesus, "the Word of life."
was manifested--who had previously been "with the Father."
show--Translate as in 1-John 1:3, "declare" (compare 1-John 1:5). Declare is the general term; write is the particular (1-John 1:4).
that eternal life--Greek, "the life which is eternal." As the Epistle begins, so it ends with "eternal life," which we shall ever enjoy with, and in, Him who is "the life eternal."
which--Greek, "the which." the before-mentioned (1-John 1:1) life which was with the Father "from the beginning" (compare John 1:1). This proves the distinctness of the First and Second Persons in the one Godhead.

For the life - The living Word. Was manifested - In the flesh, to our very senses. And we testify and declare - We testify by declaring, by preaching, and writing, 1-John 1:3-4. Preaching lays the foundation, 1-John 1:5-10: writing builds there on. To you - Who have not seen. The eternal life - Which always was, and afterward appeared to us. This is mentioned in the beginning of the epistle. In the end of it is mentioned the same eternal life, which we shall always enjoy.