Diversity in the Opinions of Secundus, as Compared with the General Doctrine of Valentinus
Secundus is a trifle more human, as he is briefer: he divides the Ogdoad into a pair of Tetrads, a right hand one and a left hand one, one light and the other darkness. Only he is unwilling to derive the power which apostatized and fell away from any one of the Æons, but from the fruits which issued from their substance.
Source: Against the Valentinians (New Advent)