In the begiing, God said, and all things came into existence (Genesis 1:3). He spoke, and it was. His word created all that exists.
That same power is in Jesus. He spoke, and storms stopped (Mark 4:39). He spoke, and the dead lived (John 11:43–44). His word creates what it declares.
At the Lord’s Table, that same divine power is active. When Christ blesses, His blessing makes it what He says it is.