Shaikh Dr Hafeezullah Sukkharwi/Madni (Allah have mercy on him) wrote to a senior seeker (most likely a colleague),
‘Pas anfas is a spiritual exercise (shugal). It is recommended for the novice (mubtadi) or intermediate (mutawaset) seeker until the remembrance of Allah (dhikr) is deeply established within him. Once the dhikr has permeated and established then there is no need for these spiritual exercises.
All praise is for Allah. The dhikr has permeated within you. In my lowly opinion there is no need for you to indulge in these exercises.
The permeation and establishment of remembrance (dhikr) means that with slightest effort and concentration the heart turns towards Allah and becomes involved (in His remembrance or following of His commandments).
Hakim al-Umma Thanawi (Allah have mercy on him) has given an example to illustrate this. That is, a teacher who has been teaching for a period of time develops such an expertise in that subject that whenever he is teaching it all the matters related to it are within his mind and grasp. However, this is not the case when he is teaching another subject.
Moreover, Hakim al-Umma (Allah have mercy on him) said that even this permeation and establishment (of dikr) is also a state (haal). The real goal (maqam) of this permeation and establishment of dhikr is to act appropriately when the time of action comes.
Allah praise is for Allah. You are blessed with all these treasures. Continue at your pace on the path Hakim al-Umma and Shaikh Mufti (Mohammad Hassan) (Allah have mercy on them) have placed you. It is thoroughly adequate and beneficial.
In how many things can we emulate others (Sufi orders & their techniques)?
Every flower has a different color and unique smell.
Moreover, the paths to the relationship with Allah are as numerous as the number of breaths of all the creatures.’
Gulistan e dil, page 16