But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
But if we walk in the light: John now proposes another case that is diametrically opposed to the one in verse six. It is a totally different matter to "walk in the light." "Walk" is in the present tense in the Greek and carries the idea of habitual action. It is the habitual practice of these hypothetical persons to order their lives in righteousness and true holiness. They keep on walking in holy living.