Adam Clarke's Commentary on the Bible - 1 John 1:6
If we say that we have fellowship - Having fellowship, κοινωνια , communion, with God, necessarily implies a partaking of the Divine nature. Now if a man profess to have such communion, and walk in darkness - live an irreligious and sinful life, he lies, in the profession which he makes, and does not the truth - does not walk according to the directions of the Gospel, on the grace of which he holds his relation to God, and his communion with him. The Gnostics, against whose errors it is... read more
John Gills Exposition of the Bible Commentary - 1 John 1:10
If we say that we have not sinned ,.... Have never sinned, in time past as well as now; deny original sin, and that men are born in sin, but affirm they come into the world pure and holy; and assert that concupiscence is not sin; and so not regarding internal lusts and desires as sinful, only what is external, fancy they have so lived as to have been without sin: but if any of us give out such an assertion, we make him a liar : that is, God, who in his word declares that the wicked are... read more