"One day my maternal uncle said to me, do you not remember God who created you? I replied, how shall I remember Him? He told me, when you change into your bedclothes, say three times in your heart without moving your tongue: God is with me, God watches over me, God is my witness … For years I did not cease to practise this, and I experienced a sweetness in my innermost being because of it." - Sahl Al-Tustari