Matter for the universe was begun spoken into existence by Elohim during the six days of creation, those events of course witnessed by only Elohim whom though soon thereafter related the events to Adam who recorded them and then signed-off at the end of that first record saying “these are the generations (toledoth/beginnings) of the heaven and the earth.” In prayer, Christians can agree with Elohim’s will to see creative miracles happen, but only by Spirit, so those who say that you can create your reality by imagining what you want it to be are just snake-oil salesmen.
