Temperance is simply a disposition of the mind which binds the passion.
Evil denotes the lack of good. Not every absence of good is an evil, for absence may be taken either in a purely negative or in aprivative sense. Mere negation does not display the character of evil, otherwise nonexistents would be evil and moreover, a thing would be evil for not possessing the goodness of something else, which would mean that man is bad for not having the strength of a lion or the speed of a wild goat. But what is evil is privation; in this sense blindness means the privation of sight.
An angel can illumine the thought and mind of man by strengthening the power of vision and by bringing within his reach some truth which the angel himself contemplates.
