What is meant by the following phrase ( Erasmus laid the egg Luther hatched )?

The phrase "Erasmus laid the egg that Luther hatched" suggests that while Desiderius Erasmus initiated the intellectual groundwork for the Reformation through his critiques of the Church and promotion of humanist ideas, it was Martin Luther who ultimately transformed these ideas into a revolutionary movement. Erasmus's writings questioned Church practices and emphasized personal faith, but he remained committed to reforming the Church from within. In contrast, Luther's bold actions, including his Ninety-Five Theses, catalyzed a break from the Catholic Church and the establishment of Protestantism. Thus, Erasmus's influence can be seen as a precursor to Luther's more radical reform efforts.