“God is a challenge rather than a notion. We do not think Him; we are stirred by Him. We can never describe Him; we can only return to Him. We may address ourselves to Him; we cannot comprehend Him. We can sense His presence; we cannot grasp His essence.”
“God is not always silent, and man is not always blind. His glory fills the world; His spirit hovers above the waters. There are moments in which, to use a Talmudic phrase, heaven and earth kiss each other, in which there is a lifting of the veil at the horizon of the known, opening a vision of what is eternal in time. Some of us have at least once experienced the momentous realness of God. Some of us have at least caught a glimpse of the beauty, peace, and power that flow through the souls of those who are devoted to Him. There may come a moment like thunder in the soul, when man is not only aided, not only guided by God’s mysterious hand, but also taught how to aid, how to guide other beings. The voice of Sinai goes on forever: “These words the Lord spoke unto all your assembly in the mount out of the midst of the fire, of the cloud and of the thick darkness, with a great voice that goes on forever.”
My favorite phrase here, “A moment like thunder in the soul.” I’ve felt that. Have you?
 Abraham Joshua Heschel, Essential Writings, (Orbis Books, Maryknoll, New York, 2011), pgs. 93-95.