And this is the judgment, that the Light has come into the world, and men loved the darkness rather than the Light, for their deeds were evil. For everyone who does evil hates the Light, and does not come to the Light lest his deeds be exposed. But he who practices the truth comes to the Light, so that his deeds may be manifested as having been done by God.”
John 3:17 For God did not send the Son into the world to judge the world, but that the world might be saved through Him.
John 3:18 He who believes in Him is not judged; he who does not believe has been judged already, because he has not believed in the name of the only begotten Son of God.
John 3:19 And this is the judgment, that the Light has come into the world, and men loved the darkness rather than the Light, for their deeds were evil.
John 3:20 For everyone who does evil hates the Light, and does not come to the Light lest his deeds be exposed.
John 3:21 But he who practices the truth comes to the Light, so that his deeds may be manifested as having been done by God.”
John 3:22 After these things Jesus and His disciples came into the land of Judea, and there He was spending time with them and baptizing.
John 3:23 And John also was baptizing in Aenon near Salim, because there was much water there; and people were coming and were being baptized—
The verse centers on "world", "light", "darkness", "judgment", "come", "loved", "rather", and "than". It is saying that the contrast between light and darkness marks a real divide in how people respond to God's work.
The nearby context moves from verse 18's "He who believes in Him is not..." into verse 22's "After these things Jesus and His disciples...", so "world" and "light" belong inside that flow. In Jesus Explains God's Saving Love, the local focus is new birth, eternal life, belief and unbelief, and God's saving love.
A plain takeaway is to answer the verse's own emphasis on "world" and "light" with trust shaped by these words, not by a vague optimism outside the passage.