But if voice and expression are given us, for the sake of understanding, how can God not hear the soul itself, and the mind, since assuredly soul hears soul, and mind, mind? Whence God does not wait for loquacious tongues, as interpreters among men, but knows absolutely the thoughts of all; and what the voice intimates to us, that our thought, which even before the creation He knew would come into our mind, speaks to God. Prayer, then, may be uttered without the voice, by concentrating the whole spiritual nature within on expression by the mind, in un-distracted turning towards God.