Several proofs have been prepared in order to demonstrate that the universe is at bottom causal, i.e. works in accord with the principle in question; perhaps not in every single case (randomness might still play a part here and there), but that causality must be the way it works at least "in general", in most of what we see; and that our minds are aware of the principle even before any experience. A famous argument or proof as proposed by Immanuel Kant from the form of Time, temporal ordering of events and "directionality" of time.