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Rene Descartes – Key Philosophical Writings

 whatever in the end be the cause assigned to my existence it must be allowed that it is a thinking thing..............  we may again inquire whether this cause derives its origin from itself or from some other thing.  For if from itself, it follows by the reasons before brought forward, that this cause must itself be God; for since it possesses the virtue of self existence, it must also  … have the power of actually possessing all the 'perfections' of which it has the idea.... but if it derives its existence from some other cause than itself, we shall again ask, for the same reason, whether this second cause exists by itself or through another, until from one step to another, we finally arrive at an ultimate cause, which will be God.....

 when we understand what it is the word God signifies, we understand that it is that, than which nothing greater can be conceived.