Hadrat generally taught the person to engage in loud dhikr (dhikr bi al-jahr in the beginning. However, it must be of average tone which would not disturb sleeping people and others nearby. He used to say: "Engaging in dhikr in this manner creates an inclination towards Allah and an excitement in one's yearning. Hadrat wrote to Hafiz Fakhr ad-Din Sahib: "When engaging in dhikr, your voice must be of average tone, but your darb (striking of the heart) must be forceful. But if, in its enthusiasm and desire, your voice becomes loud, there is no harm in it."
Because this was the initial stage of suluk, Satan tries to divert a person's attention and casts various whisperings in his heart. If anyone said to him: "Hadrat, I feel shy to engage in loud dhikr", Hadrat would reply: "Bhai! This is a Satanic whispering. Repulse it with tawwudh (seeking refuge in Allah SWT) and engage in your task with courage."
An attendant wrote to him: "Hadrat! There is the possibility of people coming to know about my dhikr if I were to engage in loud dhikr. They will say I have become a buzurg (pious person). There is also the possibility of ostentation. If you feel it appropriate, instruct me to engage in silent dhikr." Hadrat wrote the following reply: "Insha Allah, there is no fear of ostentation and people coming to know. In today's times, people regard those who engage in Allah's remembrance or those who study Din to be mad people. There is thus no occasion for ostentation. Ostentation applies to actions which are considered good by people."
Extracted from Tadhkiratul Khalil