Plotinos: Complete Works, v. 1 In Chronological Order,...

(Second objection): Please explain how differing individuals are born from the same parents. This diversity, if it be anything more than merely apparent, depends on the manner in which the two generating principles concur in the act of generation; at one time the male predominates, at other times, the female; again, they may both act equally. In either case, the ("seminal) reason" is given in its entirety, and dominates the matter furnished by either of the generating principles.