Khawaja Nasir al-Din Chirag Dehlawi (may Allah have mercy on him) said, ” Obedience to the Messenger of Allah (Allah bless him and give him peace) is imperative. Such obedience is essential in word, act and intention, because love of Allah Most High is not possible without obedience to the Messenger Muhammad (Allah bless him and give him peace).”

The Path to Perfection, page 20. By Shaykh Masihullah Khan (may Allah have mercy on him).  Highly recommended reading. An essential handbook for every salik.