1 John 1:6-7

If we say that we have fellowship with him, etc.

To have fellowship is to have. common life and spirit. If God is light, we cannot walk in darkness, without knowledge of him, living in the dark ways of sin, and have fellowship with him. To have. common life we must be children of the light, like Christ, the light of the world. As Christ gives light, so must we, if we claim to have. common life with him. As is the Son, so also must be the sons, his brethren. If thus we are in fellowship with him,

the blood of Jesus Christ cleanseth from all sin.

This implies that we must turn from darkness, walk in the light, walk with him, or we will not be cleansed.