Because Peter’s readers had been “born again” (1 Peter 1:3, 1 Peter 1:23) they share a new “Father” (1 Peter 1:17) so that they are all brothers (and sisters). As a family under God (1 Peter 2:17) they clearly need to display “brotherly love” for each other. Such “brotherly love” evokes the “sympathy” needed to “have unity of mind.”
8 Finally, all of you, have unity of mind, sympathy, brotherly love, a tender heart, and a humble mind.