Hippolytus on the Docetic Interest in the Number Thirty

When, therefore, the AEons had become equal in number and in perfection, they were, as (the Docetae) are of opinion, constituted thirty AEons in all, while each of them attains full perfection in a decade. [Philosophumena viii.1]

And these (heretics) suppose that this is what is spoken by the Saviour: "A sower went forth to sow; and that which fell on the fair and good ground produced, some a hundred-fold, and some sixty-fold, and some thirty-fold." And for this reason, the (Docetic) says, (that the Saviour) has spoken the words, "He that hath ears to hear, let him hear," because these (truths)are not altogether rumours. All these AEons, both the three and all those infinite (AEons which proceed) from these indefinitely, are hermaphrodite AEons [ibid viii.2]

From the thirty AEons, therefore, (the Son) assumed thirty forms. And for this reason that eternal One existed for thirty years on the earth, because each AEon was in a peculiar manner manifested during (his own) year. And the souls are all those forms that have been laid hold on by each of the thirty AEons; and each of these is so constituted as to discern Jesus, who is of a nature (similar to their own). (And it was the nature of this Jesus) which that only-begotten and eternal One assumed from everlasting places [ibid viii.3]