Good and evil are essential differences of the act of the will. For good and evil pertain essentially to the will; just as truth and falsehood pertain to the reason, the act of which is distinguished essentially by the difference of truth and falsehood (according as we say that an opinion is true or false.) Consequently, good and evil volition are acts differing in species.
Thomas AquinasGod himself would not permit evil in this world if good did not come of it for the benefit and harmony of the universe.
Thomas AquinasThe splendor of a soul in grace is so seductive that it surpasses the beauty of all created things.
Thomas Aquinas