God so loved the world that he gave his only-begotten Son, so that everyone who believes in him might not perish but might have eternal life. For God did not send his Son into the world to condemn the world, but that the world might be saved through him. (Jn 3:16-21)
https://bible.usccb.org/bible/readings/041923.cfm
Some have called John 3:16 the heart of the gospel, and perhaps it is. But without “Love one another as I have loved you” (Jn 13:34), the gospel is meaningless. According to Jesus the real heart of the gospel is to love, to love God and to love neighbor. And it's not possible to separate them. As Dorothy Day said, "I only love God as much as the person I love the least."