rav rafael speaks from the end of the book of Exodus as the Shechina takes residence on the Tabernacle. The Shechina is the embodiment of Hashem's word. We learn of the nature of our words and speech as vessels, both in speech and in silence. We turn to John 6 where Yeshua teaches his disciples about Hashem's word as manna from Heaven. From this we learn the value of our words as they abide in Torah's eternal words which descend from Heaven.