God is an inwardly lawful being. An inwardly lawful being is righteous, blessed, and holy. Righteousness is lawfulness; blessedness is the union of lawfulness and happiness; and holiness is their identity. The divine nature is one according to the universal concept, but three according to the particular conception thereof. And the persons are moral subjects, divine particulars, to whom the divine nature belongs, as a universal predicate. There are therefore three divine persons conceivable, distinguished by the fundamental attributes of divinity, which are identified in one nature.
Gress, Julian, 2019, Christ Condemned: On the Incarnation and the Trinity 3, 35–36, 91–92