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.
It may, however, be asked, “Who among men can so exhibit the light of God in his life, as that this likeness which John requires should exist; for it would be thus necessary, that he should be wholly pure and free from darkness.” To this I answer, that expressions of this kind are accommodated to the capacities of men; he is therefore said to be like God, who aspires to his likeness, however distant from it he may as yet be. The example ought not to be otherwise applied than according to this passage. He walks in darkness who is not ruled by the fear of God, and who does not, with a pure conscience, devote himself wholly to God, and seek to promote his glory. Then, on the other hand, he who in sincerity of heart spends his life, yea, every part of it, in the fear and service of God, and faithfully worships him, walks in the light, for he keeps the right way, though he may in many things offend and sigh under the burden of the flesh. Then, integrity of conscience is alone that which distinguishes light from darkness. 