In each era there is the door of the “Prophet of the Time”, the messenger of GOD, made able by GOD to guide people to HIM. When the “Prophet of the Time” passes away, his spiritual irradiation is in no way reduced, being perpetuated to his spiritual successors who are great saints, and this, until the advent of a new Prophet. ( Prophet Muhammad was the last and the seal of all Prophets & Messengers of GOD)
 
Thus the Spiritual emission from our beloved Prophet Muhammad (blessings and peace of GOD be upon him) has never ceased enlightening hearts throughout the years, through his spiritual heirs, the great masters of Islam. Those who believe in their spiritual transmission, in their spiritual mediation, find themselves attached to our beloved Prophet Muhammad (blessings and peace of GOD be upon him) through their intermediary.