Mormon 9:18–20

And there were many mighty miracles wrought by the hands of the apostles. And if there were miracles wrought then, why has God ceased to be a God of miracles and yet be an unchangeable Being? And behold, I say unto you he changeth not; if so he would cease to be God; and he ceaseth not to be God, and is a God of miracles. And the reason why he ceaseth to do miracles among the children of men is because that they dwindle in unbelief, and depart from the right way, and know not the God in whom they should trust.

From section: Moroni’s Invitation to Believe

From page: Moroni Finalizes the Book of Mormon

Commentary