6. Shame on them who busy themselves touching the generation on high. For if this birth, which hath witnesses without number, and had been proclaimed so long a time before, and was manifested and handled with hands, can by no man be explained; of what excess of madness do they come short who make themselves busy and curious touching that unutterable generation? For neither Gabriel nor Matthew was able to say anything more, but only that it was of the Spirit; but how, of the Spirit, or in what manner, neither of them hath explained; for neither was it possible.