Final answer:
Cyrano helps Christian woo Roxane because of his own unrequited love for her, expressing his feelings through Christian; he finds this venture amusing as it allows him to experience romance vicariously.
Step-by-step explanation:
The discussion about Cyrano's motivations for aiding Christian in courting Roxane is a classic subject in the study of literature, specifically within the analysis of the play 'Cyrano de Bergerac' by Edmond Rostand. Cyrano, a talented poet with a pronounced nose, helps Christian because he himself is in love with Roxane but feels that he is not physically attractive enough for her. Using his poetic skills, he provides Christian with the eloquent language needed to win Roxane's heart, effectively expressing his own feelings through another. The venture amuses Cyrano, as it serves as a way to vicariously experience the joys of romance he believes he cannot have himself due to his appearance.