35 But, say my opponents, if souls are mortal and of neutral character, how can they from their neutral properties become immortal? If we should say that we do not know this, and only believe it because said by One mightier than we, when will our readiness of belief seem mistaken if we believe that to the almighty King nothing is hard, nothing difficult, and that what is impossible to us is possible to Him and at His command? For is there anything which may withstand His will, or does it not follow of necessity that what He has willed must be done?
Are we to infer from our distinctions what either can or cannot be done; and are we not to consider that our reason is as mortal as we ourselves are, and is of no importance with the Supreme? And yet, O you who do not believe that the soul is of a neutral character, and that it is held on the line midway between life and death, are not all whatever whom fancy supposes to exist, gods, angels, daemons, or whatever else is their name, themselves too of a neutral character, and liable to change in the uncertainty of their future? For if we all agree that there is one Father of all, who alone is immortal and unbegotten, and if nothing at all is found before Him which could be named, it follows as a consequence that all these whom the imagination of men believes to be gods, have been either begotten by Him or produced at His bidding.
Are they produced and begotten? They are also later in order and time: if later in order and time, they must have an origin, and beginning of birth and life; but that which has an entrance into and beginning of life in its first stages, it of necessity follows, should have an end also.
Source: Against the Heathen (New Advent)