Rhema (ῥῆμα in Greek) literally means an "utterance" or "thing said" in Greek. It is a word that signifies the action of utterance.
So then faith comes by hearing, and hearing by the WORD (RHEMA) of God.
God's spoken word to our hearts is the sweetest! Did you notice the words "low noise?" I find that when I get still that is when I hear God's RHEMA the most.