Here is a definition carefully to note. 'Original justice,' according to St Thomas, is the perfect subjection of man's lower powers to his reason, of his reason to God, and of his body to his soul.' He marks off 'grace,' i.e., sanctifying grace, from 'original justice.' ' Original justice then implies freedom from concupiscence, from folly, and from bodily weakness and incapacity of all sorts. A man in original justice would have no difficulty in banishing from his mind thoughts that he recognised as foolish and undesirable. He would have absolute control over his emotions and passions.
Of God and His Creatures: 4.51