Youth’s the season made for joys,
Love is then our duty.

The couplet frames youth as a natural, time-limited phase oriented toward pleasure and emotional openness. By calling love a “duty,” the speaker playfully inverts moral language: instead of duty meaning restraint, it becomes an obligation to embrace affection, courtship, and delight while one is young. The line suggests a carpe-diem ethic—joy and love are not merely permitted but appropriate to the season of life when desire and possibility feel most abundant. Implicitly, it also hints at the transience of youth: if joys and love belong especially to that period, postponement risks missing what cannot be fully recovered later.