One way an author uses direct characterization is by telling the reader about the character through

One way an author uses direct characterization is by telling the reader about the character through description.

The author describes the character and his or her personality and attributes. description may be through the use of adjectives, statement of motivation, presentation of internal conflicts, and events that affected the character's state of mind.

Satan's regret is shown on the following lines:

The happier Eden, shall enjoy their fill Of bliss on bliss, while I to Hell am thrust, Where neither joy nor love, but fierce desire, Among our other torments not the least, Still unfulfill'd with pain of longing pines.

The excerpt of the text shows Satan's regret that he can never experience love by the use of comparison, keywords and an archaic phrase. The comparison made of Eden with Hell, while talking about Eden the words enjoy and bliss are used and it is describe as an enjoyable place. While talking about Hell there is neither joy nor love, it is seen as a place of torment. The keywords that show regret are: torment, pain, unfulfilled and desire. The archaic phrase that shows the deepest regret is "Still unfulfilled with pain of longing pines" longing pines is an old phrase used to express suffering, in the excerpt the suffering it is referred to is the lack of love.