Something cannot arise from nothing:
Descartes’ First Proof of the Existence of God in Meditation III:
Axiom: There is at least as much reality in the efficient and total cause as in the effect of that cause.
Axiom: Something cannot arise from nothing.
Axiom: What is more perfect cannot arise from what is less perfect.
Definition: The nature of an idea is such that, of itself, it requires no formal reality except what it derives from my thought.
Definition: Objective mode of being belongs to ideas by their nature; formal mode of being belongs to the causes of ideas.
Definition: God is a substance that is infinite, independent, omniscient, omnipotent...
(1) In order for a given idea to contain such and such objective reality, it must surely derive it from some cause which contains at least as much formal reality as there is objective reality in the idea.
(2) There must be a cause which contains formally all the reality which is present objectively in the idea.
(3) If the objective reality of an idea cannot come from me, it must come from something else.
(4) The attributes of God are such that they could not have come from me.
(5) They must have come from God; therefore, God exists.