Say to the Pagans who reject the attribute AL- Rahman and think it is another god: Invoke Allah or invoke AL-Rahman whichever you choose, for to Him belong all the graceful Names which are the supreme appellations in which His unique qualities are ascribed. And to avoid -O Muhammad- their mockery and derision when you engage in the act of worship, you just entertain the profound reverence dutiful to Allah. And do not voice your prayer loudly nor pronounce it inaudibly or below your breath but hold a middle degree between the two extremes.