Passage
For God sent not his Son into the world, to judge the world: but that the world may be saved by him.
For God sent not his Son into the world, to judge the world: but that the world may be saved by him.
John 3:15 That whosoever believeth in him may not perish, but may have life everlasting.
John 3:16 For God so loved the world, as to give his only begotten Son: that whosoever believeth in him may not perish, but may have life everlasting.
John 3:17 For God sent not his Son into the world, to judge the world: but that the world may be saved by him.
John 3:18 He that believeth in him is not judged. But he that doth not believe is already judged: because he believeth not in the name of the only begotten Son of God.
John 3:19 And this is the judgment: Because the light is come into the world and men loved darkness rather than the light: for their works were evil.
The verse centers on "world", "saved", "sent", and "judge". It is saying that the verse draws attention to "world" and "saved", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "For God so loved the world as..." into verse 18's "He that believeth in him is not...", so "world" and "saved" 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 "saved" with trust shaped by these words, not by a vague optimism outside the passage.