Ways of The Prophet (S.A.W)
by Sheikh Muhammad Abdul Hai ArifiThe practice of reciting 
Hadrat Abu Hurairah (Radi Allahu Ta’ala Anhu) narrated that the Messenger of ALLAH (Sallallahu Alaihi Wa Sallam) said,
(There is no might and no power except in ALLAH) is remedy for ninety nine diseases, the lightest of which is anxiety. He said that ALLAH’s Messenger (Sallallahu Alaihi Wa Sallam) offered to guide him to a word from under the Throne which was part of the treasure of paradise, it being,
(There is no might and no power except in ALLAH)”. [Mishkat]
Ulema have therefore, expressed an opinion that this phrase is the best helper. [Madarijun Nubuwah]