question #1 Sahih al-Bukhari 613, Book 10, Hadith 11 : What is the significance of saying ‘La hawla wala quwata illa billah’ during the call to prayer?

“Some of my companions told me that Hisham had said, “When the Mu’adh-dhin said, “Haiyi `alassala
(come for the prayer).” Muawiya said, “La hawla wala quwata illa billah (There is neither might
nor any power except with Allah)” and added, “We heard your Prophet saying the same.”