 While the Paraclesis, the Enchiridion, and the Moriae Encomium constitute the main sources for Erasmus’ thoughts on Christian morality, this theme is so pervasive in his works, that any attempt to define his concept of pietas “would be almost tantamount to summarizing and synthesizing everything that has been written on Erasmus” (O’Malley in CWE 66: xv). Three characteristics stand out, however. Piety is an internal quality independent of the outward observance of rites; it is perfected through divine grace; and it is inclusive, that is, open to all.