The tale of the Golden Fleece teaches about ambition, desire, and the consequences of pursuing one's goals. Characters such as Jason demonstrate that although ambition can drive individuals to achieve their dreams, it may also lead them into situations fraught with danger and betrayal. The quest for the fleece not only represents the pursuit of glory and success but also reveals the importance of perseverance and the implications of self-interest at the expense of others. Ultimately, it highlights the duality of ambition: it can be both a source of great achievement and profound tragedy.