...two generators are required. For the causes need to be suited to the production of their required effect, and thus we refer to two generators or producers (מולידים, molidim).
Part 2: Therefore any given light will only emerge... The beginning of this phenomenon is in the supernal lights, as stated above, for it is these that were generated for the sake of the governmental order. Each light has its own particular function, and this light will only emerge in the developmental chain if it has for its root two suitable causes in order to jointly produce their effect – the light – which then emerges compounded of both of them.