a special dua

Anas [r] reported that Allahs Messenger [s] used to say quite frequently:


O, turner of the heart, keep me steadfast upon your religion.
I said:

Allah's Apostle, we do affirm faith in you and in that what you have been sent with [despite this] you entertain fear about us;

where upon he [s] said :


Yes, verily the hearts are between two Fingers from the Fingers of Allah [meaning power, authority , etc] and he turns them as He likes.


[Tirmizi, Ibn Majah, Mishkat-ul Masabih, translated by Abdul Hameed Siddiqui, Vol. 1, Kitab-ul-Qadr, Hadith 102, Kitab Bhavan publications.]