Enter the term generosity into your theological dictionary. It is not yet there, at least not in the dictionaries on my shelf. Most reference books ungenerously skip from “Generation, Eternal” to “Genevan Catechism” or from “Gaudium et Spes” to “Genocide” without “Generosity” slipping in.
Don’t blame the authors. They need something with which to work, and the Hebrew and Greek words translated as “generosity” rarely appear in the biblical texts. Since theology (theos+logos) involves words or language about God, generosity has to be attached—as in “the generosity of God.”