"It is in spirit and in mind, then, that he says that one should pray and sing to God; he does not say anything at all about the tongue. The reason is that this spiritual prayer is more interior than the tongue, more deeply interiorized than anything on the lips, more interiorized than any words or vocal song. When someone prays this kind of prayer he has sunk deeper than all speech, and he stands where spiritual beings and angels are to be found; like them, he utters ‘holy’ without any words. But if he cease from this kind of prayer and re-commence the prayer of vocal song, then he is outside the region of the angels and he becomes an ordinary man again."