Hazrat Mawlana Shah Wasiullah Khan saheb ra, a senior & exceptional khalifa of Hakeeul Ummat ra said;

“People judge the integrity of an earthenware, that is it broken or intact, by its noise (resulting from tapping on it). Similarly, we (the ahlullah) deduce from a salik’s way of talking and writing some information about his qalbi (inner) states.”  

Halaat e Muslehul ummat ra, page 51