 Nicolas of Cusa’s De Pace Fidei (1453) marks an important step towards a more comprehensive, Christian-humanist conception of toleration, though in the conversations among representatives of different faiths his core idea of “one religion in various rites” remains a Catholic one. Still, the search for common elements is a central, increasingly important topic in toleration discourses. This is much further developed in Erasmus of Rotterdam’s humanist idea of a possible religious unity based on a reduced core faith, trying to avoid religious strife about what Erasmus saw as non-essential questions of faith (adiaphora).