“I am the light of the world; he that followeth me shall not
walk in darkness but shall have the light of life.” John 8:12

“If we walk in the light, as He is in the light, we have fellowship one with another,
and the blood of Jesus Christ his Son cleanseth us from all sin.”

“Walking in the light, as God is in the light, believers have communion with
each other. The world is selfish. The flesh, the passions, seek their own
gratification; but, if I walk in the light , self has no place there. I can enjoy
the light, and all I seek in it, with another, and there is no jealousy. If
another possess a carnal thing, I am deprived of it. In the light we have
fellow-possession of that which He gives us, and we enjoy it the more
by sharing it together. As much as one is in the light, so much will we have fellow-enjoyment
with another who is in it.

To walk in the light as God is in it, to have fellowship with one another, to be
cleansed from all sin by the blood; these are the three parts of Christian

“Truly our fellowship is with the Father and with His Son Jesus Christ.”
The effect is, we have the Father and the Son, and we have nothing more to seek.
I have the Father and the Son. I have a great deal to learn; but I am in the Father
and the Son, and I am in the truth. I do not want to seek it if I am in it. I have
the very eternal God in whom I dwell—I have come to the Father. When there is
a consciousness of this, oh, what comfort and what peace! It not only guards
us from evils without, but it gives spiritual rest within. If I am striving to get
something, I have no communion. If I want to get to the Father, when I am in His
presence already, I have no communion; and if I am not brought up there, I cannot
have the sense of what the conscience ought to be in God’s presence. The joy
is, that our fellowship is with the Father, and not in the hope of getting there.
“These things write we unto you, that your joy may be full.” There is where
God brings the saint if there is humbleness. If there is not humbleness, we shall slip.
When we lose the sense of God’s presence—the sense of it (because we are always
in His presence in truth) we are at the point to sin. When the Spirit is not grieved,
the soul is in the presence of God for joy, learning holiness, it is true, but in joy,
because occupied [with our Lord Jesus Christ] in communion instead of in detection.

“My peace I give unto you.” What was that peace? There was no wandering
affections—there could not be, and so there was full peace of heart with God.
Christ having been revealed to the soul, the world is cast out, and Christ is everything,
and there is perfect joy.

There are three things which characterize a Christian. First, “he is in the light as God is
in the light.” Second, “we have fellowship one with another.” We are there together,
and all have fellowship by the same Holy Spirit dwelling in all.
Third, we can be there because “the blood of Jesus Christ cleanseth us from all sin.”
The more thoroughly in the light, the more it is seen that there is no spot on us through
that blood. The effect of being in the light is, that we confess our sins. “In whose spirit
there is no guile.”

(J.N. Darby, Nine Lectures on the 1st Epistle of John)