In the seventeenth chapter of the Second Book of “The Guide” Maimonides says as follows: “Everything produced comes into existence from non-existence; even when the substance of a thing has been in existence, and has only changed its form, the thing itself which has gone through the process of genesis and development, after having arrived at its final state, has properties different from those which it possessed at the commencement of the transition from potentiality to reality or before that time.... It is quite impossible to infer from the qualities which a thing possesses after having passed through all the stages of its development what its condition was at the moment when this process commenced; nor does the condition of a thing at that moment show what its previous condition had been. If you make this mistake, and attempt to prove the nature of a thing in potential existence by its properties when actually existing, you will fall into great confusion; you will reject evident truth and admit false opinions.... If philosophers would consider this well, and reflect on it, they would find that it represents exactly the dispute between Aristotle and ourselves. We, the followers of Moses, our teacher, and of Abraham, our father, believe that the universe has been produced from nothing, and has developed in a certain manner, and that it has been created in a certain order. The Aristotelians oppose us, and found their objections on the properties which the things in the universe possess when in actual existence and fully developed. We admit the existence of these properties, but hold that these properties themselves have come into existence from absolute non-existence. The arguments of our opponents are thus refuted; they have demonstrative force only against those who hold that the nature of things as at present in existence proves the Creation. But this is not my opinion.” This reasoning holds good with regard to the modern theory of Evolution. We may be able to discover numerous facts in evidence of this theory, we may well conceive the idea of a protoplasm developing into a whole system of worlds, and yet our belief in the truth of the Biblical account of the Creation is not shaken in the least. The laws of Evolution are the result of the creative act of the Almighty, and not its causes; they include nothing that could disprove the correctness of the theory of Creatio ex nihilo.