For God so loved the world that He gave His one and only Son, that everyone who believes in Him shall not perish but have eternal life. — John 3:16

God loved the world and gave His only Son. That's the Gospel in a verse — not a moral lesson but an announcement. God was in Christ reconciling the world to Himself, not counting their trespasses against them. This is love: not that we loved God, but that He loved us and sent His Son as a propitiation for our sins. Believe in Him and you won't perish — you'll have everlasting life.