1 John 1:6-7

Verse 6. If we say that we have fellowship with him. If we reckon ourselves among his friends, or, in other words, if we profess to be like him: for a profession of religion involves the idea of having fellowship with God, 1Jn 1:3, and he who professes that should be like him.

And walk in darkness. Live in sin and error. To "walk in darkness" now commonly denotes to be in doubt about our religious state, in contradistinction from living in the enjoyment of religion. That is not, however, probably the whole idea here. The leading thought is, that if we live in sin, it is a proof that our profession of religion is false. Desirable as it is to have the comforts of religion, yet it is not always true that they who do not are not true Christians, nor is it true by any means that they intend to deceive the world.

We lie. We are false professors; we are deceived if we think that we can have fellowship with God, and yet live in the practice of sin. As God is pure, so must we be, if we would be his friends. This does not mean necessarily that they meant to deceive, but that there was an irreconcilable contradiction between a life of sin and fellowship with God.

And do not the truth. Do not act truly. The profession is a false one. Compare Jn 3:22. To do the truth is to act in accordance with truth; and the expression here means that such an one could not be a Christian. And yet how many there are who are living in known sin who profess to be Christians! How many whose minds are dark on the whole subject of religion, who have never known anything of the real peace and joy which it imparts, who nevertheless entertain the belief that they are the friends of God, and are going to heaven! They trust in a name, in forms, in conformity to external rites, and have never known anything of the internal peace and purity which religion imparts, and in fact have never had any true fellowship with that God who is light, and in whom there is no darkness at all. Religion is light; religion is peace, purity, joy; and though there are cases where for a time a true Christian may be left to darkness, and have no spiritual joy, and be in doubt about his salvation, yet still it is a great truth, that unless we know by personal experience what it is to walk habitually in the light, to have the comforts of religion, and to experience in our own souls the influences which make the heart pure, and which bring us into conformity to the God who is light, we can have no true religion. All else is but a name, which will not avail us on the final day.
Verse 7. But if we walk in the light. 1Jn 1:5. Walking in the light may include the three following things:

(1.) Leading lives of holiness and purity; that is, the Christian must be characteristically a holy man, a light in the world, by his example.

(2.) Walking in the truth; that is, embracing the truth in opposition to all error of heathenism and infidelity, and having clear, spiritual views of truth, such as the unrenewed never have. See 2Cor 4:6, 1Cor 2:9-15; Eph 1:18.

(3.) Enjoying the comforts of religion; that is, having the joy which religion is fitted to impart, and which it does impart to its true friends, Ps 94:19, Isa 57:8, 2Cor 1:3, 13:11. Jn 12:35.

As he is in the light. In the same kind of light that he has. The measure of light which we may have is not the same in degree, but it is of the same kind. The true Christian in his character and feelings resembles God.

We have fellowship one with another. As we all partake of his feelings and views, we shall resemble each other. Loving the same God, embracing the same views of religion, and living for the same ends, we shall of course have much that is common to us all, and thus shall have fellowship with each other.

And the blood of Jesus Christ his Son cleanseth us from all sin. See the sentiment here expressed fully explained Heb 9:11. When it is said that his blood cleanses us from all sin, the expression must mean one of two things--either that it is through that blood that all past sin is forgiven, or that that blood will ultimately purify us from all transgression, and make us perfectly holy. The general meaning is plain, that in regard to any and every sin of which we may be conscious, there is efficacy in that blood to remove it, and to make us wholly pure. There is no stain made by sin so deep that the blood of Christ cannot take it entirely away from the soul. The connexion here, or the reason why this is introduced here, seems to be this: The apostle is stating the substance of the message which he had received, 1Jo 1:5. The first or leading part of it was, that God is light, and in him is no darkness, and that his religion requires that all his friends should resemble him by their walking in the light. Another, and a material part of the same message was, that provision was made in his religion for cleansing the soul from sin, and making it like God. No system of religion intended for man could be adapted to his condition which did not contain this provision, and this did contain it in the most full and ample manner. Of course, however, it is meant that that blood cleanses from all sin only on the conditions on which its efficacy can be made available to man--by repentance for the past, and by a cordial reception of the Saviour through faith.

(b) "walk" Jn 12:35 (c) "blood" Eph 1:7, Heb 9:14, 1Pet 1:19, Rev 1:5
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