This is why all should love God. All other targets of love are unjust, for God alone is holy. For God to love Himself is not wrong, for He alone is worthy. It is just that God display His glory for glorification of anything or anyone other than the One True Holy God is idolatry. For God to be God He must both display His glory and not compromise it. Jonathan Edwards discussed this whole premise in The End For Which God Created The World.