Who Do You Love?
If the depth of love is measured by the value of its gift, then God’s love could not be greater, for his love-gift is his most precious possession—his only, eternally beloved Son. He could not love more.
The idea here then is not one of a possible projected condemnation for the unbeliever but the necessity of escaping an already existing condemnation
Already in need of a Saviour before God’s Son comes on his saving mission, this person compounds his or her guilt by not believing in the name of that Son. As with the arrogant critic who mocks a masterpiece, it is not the masterpiece that is condemned, but the critic
Light has come into the world; with the incarnation of the Word, the light shone in the darkness (cf. notes on 1:4–5) even more brightly than at the creation. As the light of the world (8:12), Jesus is the revelation of God and the objectification of divine holiness and purity.
while the lover of darkness shuns the light out of fear of exposure, shame and conviction, the lover of light does not prance forward to parade his wares with cocky self-righteousness, but comes into the light, so that it may be seen plainly that what he has done has been done through God. This strange expression makes it clear that the lover of light is not some intrinsically superior person