I suggest that the best way to understand Philo's writings and motivations is to loosen the modern attempt at classification and try to apprehend him on his own terms. Sophia is bound together with action and especially with worship, as is evident in Philo's writings on the sect of the Therapeutae from his On the Contemplative Life . The latter part of the sentence is full of paradoxes, which are used to simultaneously evade and refer to the identity of God.
Apophasis moves toward the transreferential.
It cannot dispense with reference, but through the constant turning back upon its own referential delimitations, it seeks a momentary liberation from such delimitations. Philo's mysticism is, unsurprisingly, idiosyncratic. Mystical writers often claim to be inspired, and promise the devoted reader a glimpse of that inspiration, or describe poetically their own experience of the divine. Mortal and immortal may not share the same home. And therefore the setting of reason and the darkness which surround it produce ecstasy and inspired frenzy.