Aquinas next explains that things of this universe have a transitorynature in which they are generated and then corrupt over time. Because of this the thingsof nature can be said to be "possible to be and possible not to be". Since it isimpossible for these things always to exist, then it indicates a time when they did notexist. If there are things which are transitory (and are possible not to be) then at onetime there could have been nothing in existence. However, as was already explained in hissecond proof, there must have been a first cause that was not of transitory nature thatcould have generated the beginning of nature.


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