The most immediately recognizable theme in 'The Decameron' is the sheer force of love—or lust—as a destabilizing, often chaotic, driver of action. It's not the courtly, poetic love you might find elsewhere; it's visceral, messy, and frequently hilarious or tragic. It makes monks cheat, wives scheme, and fools become clever. I think Boccaccio is less interested in judging these impulses than in observing their universal power to override social station and reason.
Related to this, the cunning intelligence of ordinary people outsmarting those in authority is everywhere. The trickster, whether a clever wife or a quick-thinking servant, is a hero. These stories celebrate wit over brute strength or noble birth, which must have felt radical in a fourteenth-century feudal society. It’s a thread of social satire that pokes at the hypocrisy of clergy and the pretensions of the rich.
Finally, fortune’s wheel spins constantly. Characters experience sudden reversals, from rags to riches or from safety to peril, often through coincidence or accident. This isn’t just random chance; it’s a commentary on the instability of life, especially poignant given the Black Death framing the entire collection. The tales suggest that adaptability, humor, and human connection are our best defenses against fate’s whims.