The Lord sent Ezekiel to prophesy against the shepherds of Israel who were pasturing themselves rather than their sheep (see also Ez 34:10). In other words, Israel's leaders were self-serving rather than serving God's people. They were selfish.
Selfishness is the attitude which promotes the worst things you can do to your family, church, society, and those you love. Selfishness is an addiction. If not for God's grace, we become self-aholics, ego-maniacs, tyrannical centers of the world. Selfishness is the path to hell and, ironically, to self-destruction.
Nonetheless, we cannot help being selfish. It is automatic, natural, and destructive. We would have to have a new nature and be born again to escape the trap of selfishness. The good news is that Jesus died and rose to give us a new nature so that we can "live no longer for" ourselves "but for Him Who for (our) sakes died and was raised up" (2 Cor 5:15). Then, freed from the addiction to self, we can truly love God, ourselves, and others.