(Ibn al-Qayyim, al-Madaarij 3/485)

The perfection of Tawheed is found when there remains nothing in the heart except Allaah, the servant is left loving those He loves and What He loves, hating those He hates and what He hates, showing allegiance to those He has allegiance to, showing enmity towards those He shows enmity towards, ordering what He orders and prohibiting what He prohibits.