“Hashem Echad” – God is One – means something frightening. It means that God is the only being that actually exists. Nothing else exists. God creates and recreates us at every moment, and our continued existence is assured only because God wills it. Our existence is dependent on what God decrees, and it can stop at any moment. God’s existence cannot stop. So the only thing that really exists is God. Therefore, when we connect with God, we connect to the whole source our being.