The voice of God is the source of the spirit of faith
There are two dimensions of faith:
THE WORD OF FAITH
«But the righteousness of faith speaks in this way, “Do not say in your heart, ‘Who will ascend into heaven?’” (that is, to bring Christ down from above) or “’Who will descend into the abyss?’” (that is, to bring Christ up from the dead). But what does it say? “The word is near you, in your mouth and in your heart” (that is, the word of faith which we preach)» (Romans, 10: 6-8)