He answers, surely whatever man thinks and considers in his heart, he does not act upon it until pronouncing it with his lips; nor does he mean it. The uttered word cleaves the air and soars up, flying throughout the world and is made into a sound. Winged creatures carry it and raise it to the king, where it penetrates his ear. This is the meaning of, “And Hashem heard the voice of your words” (Devarim 5:25), “and Hashem heard it, and his anger was kindled” (Bemidbar 11:1).
For that reason, every prayer and entreaty that man presents before Hashem should be verbally uttered. If he does not utter them with his lips, his prayer is no prayer, nor his entreaty an entreaty. Once the words are uttered and cleave the air, soaring and flying and becoming a sound; they are taken and joined to a sacred place in the king’s head.