What is the meaning of Allah Glorious and High's words "And utter not thy prayer loudly, not be low in it" (xvii. 110) in relation to supplication (du'a'), according to the hadith reported by 'A'isha (peace be upon her)?
 'A'isha reported that so far as these words of (Allah) Glorious and High are concerned:                     " And utter not thy prayer loudly, not be low in it" (xvii. 110) relate to supplication (du'a').