 Price did not publish this piece for some time, and remained concerned that the “particular imperfection of language” rendered him “incapable of stating [his view] with sufficient correctness and clearness” (R 286).  It is indeed rather puzzling. His view is clearly influenced by the neo-Platonism which, presumably, he gets from Cudworth. Necessary truths depend on the Forms, on their self-identity. The Forms constitute a purely intelligible realm, and other things are intelligible only in so far as they participate in the Forms. Since the Forms are purely intelligible beings their mode of being, the manner in which they exist is by being thought. That which thinks the Forms, namely God, is that in which they are. They cannot exist independently, because their very being is to be a part of his nature. And it is his own nature governs his will.