(1) As potential to, and receptive of esse , essence is thus a principle through which and in which a thing exists.(2) two traditions, each of whose esse is opposition to the central tenets of the other(3) Essence is the intrinsic limitation of esse , the crystallization of existence, bordered by nothingness.(4) We see here clearly how Thomas has appropriated Plato's thought for his own ‘existential’ (in the sense of esse ) purposes.