When you observe prayer do not recite Arabic phrases alone like those who are unmindful – for the prayer and forgiveness sought by such persons is nothing more than a superficial demonstration, which is devoid of essence; their prayers are not sustained by any foundations. When you offer your prayer, besides the verses of the Quran which are the Word of God, and besides the various prayers taught by the Holy Prophet, which are the words of the Messenger, make all your other entreaties in your native tongue so that the humility and meekness that they are born of may touch your heart.
(Noah’s Ark, pp. 111-112)