The article deals with the notion of générosité, an important concept of the 17th century moral philosophy, as well as with the metamorphosis of the meaning of this passion and/or virtue. The starting point of this metamorphosis is générosité as a virtue of the late medieval and early modern French noble man, whereas the end point is générosité as the passion/virtue of Descartes’ (equally) rational beings. The paper analyses this phenomenon in Molière’s play Don Juan, and in Descartes’ and Spinoza’s texts.