#this is actually terrifying

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

How [do] we have access to grace through our Lord Jesus Christ? The Savior Himself tells us: “I am the Door,” and “No one comes to the Father except by Me.” …This Door is the truth, and liars cannot enter in by the door of truth. Again, this Door is righteousness, and the unrighteous cannot enter in by it. The Door Himself says: “Learn from Me, for I am gentle and lowly in heart.” So neither the irascible nor the proud can enter in by the door of humility and gentleness. Therefore, if anyone wants to have access to the grace of God– which, according to the word of the apostle, comes through our Lord Jesus Christ, and in which Paul and those like him claim to stand– it is essential that he be cleansed of all [vices, for all are opposed to Christ]. Otherwise, those who do what is contrary to Christ will not be allowed to go in by that Door, which will remain closed [against such corruption,] and [so justly] keep out those who are incompatible with Him.

Origen of Alexandria