Herein as to us has been manifested the love of God, that God has sent his only begotten Son into the world, that we might live through him. Herein is love, not that we loved God, but that he loved us, and sent his Son a propitiation for our sins.
1 John 4:7 Beloved, let us love one another; because love is of God, and every one that loves has been begotten of God, and knows God.
1 John 4:8 He that loves not has not known God; for God is love.
1 John 4:9 Herein as to us has been manifested the love of God, that God has sent his only begotten Son into the world, that we might live through him.
1 John 4:10 Herein is love, not that we loved God, but that he loved us, and sent his Son a propitiation for our sins.
1 John 4:11 Beloved, if God has so loved us, we also ought to love one another.
1 John 4:12 No one has seen God at any time: if we love one another, God abides in us, and his love is perfected in us.
The verse centers on "world", "only begotten Son", "herein", "been", "manifested", "love", and "sent". It is saying that the verse draws attention to "world" and "only begotten Son", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 8's "He that loves not has not known..." into verse 11's "Beloved if God has so loved us...", so "world" and "only begotten Son" belong inside that flow. In 1 John context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "world" and "only begotten Son" with trust shaped by these words, not by a vague optimism outside the passage.