As we obeyed the gospel of Jesus (i.e. believed in Jesus) we were born again which leads us to loving others (sincerely, earnestly, etc.).
The response to the message is understand that our identity in Jesus compels/causes us to love others, even amid suffering/hardships such as the ones Peter’s readers were experiencing.
Scripture: 1 Peter 1:17-25; Galatians 5:7; Romans 12:9; Isaiah 40:6-9; Matthew 7:24-27