The present study is primarily concerned with understanding Giacomo Leopardi's 'system' described in 1820 in his Zibaldone, which fuses the incongruent relationship between the myth-like 'origin story' of humanity described in Genesis and its modernity into a comprehensible reality through the medium of irony. Due to what scholars have called a shift from historic pessimism to cosmic pessimism in the year 1824, this study focuses on his opening story of the Operette Morali, 'La storia del genere umano,' written in early 1820.