#matthew poole

This is the reason, the evidence and great cause of condemnation [for all sin]: that Light is come into the world. Christ is the Light, foretold by the prophet Isaiah. He is styled, in the beginning of [John’s] Gospel, the true Light; that is, He has in perfection all the excellent qualities of light: the power to enlighten the minds of men in the knowledge of saving truth, to warm the affections with the love of it, to revive the disconsolate, and to make the heavenly seed of the Word to flourish and fructify in their lives. This Light is come into the world; that signifies not only His Incarnation, but His revealing the merciful counsel of God for our salvation, which the clearest spirits could never have discovered; [Christ alone] has opened the way that leads to eternal life.

But men loved darkness rather than light; because their deeds were evil: they preferred, chose, and adhered to their ignorance and errors, [choosing these over] the light of life, the saving knowledge of the gospel. Their ignorance is affected and voluntary, and no colour of excuse can be alleged for it; no, it is very culpable and guilty, by neglecting to receive instruction from the Son of God. The vices and lusts of men are the works of darkness, the fruits of their ignorance and errors; and they are so pleasant to the carnal corrupt nature, that to enjoy them securely, they obstinately reject the light of the gospel. This aggravates their sin and sentence.

Matthew Poole; Commentary on John 3:19