 Heidanus wrote "De Sabbate" (1658 in Latin, later in Dutch) in reply; Andreas Essenius attacked Heidanus, and Cocceius became drawn in, to what became a long controversy.The position Heidanus held for decades as leader of Leiden Cartesianism eventually led to his dismissal by the university in 1676.This happened after he with Burchard de Volder and Christophorus Wittichius published a rebuttal of the university's condemnation of Cartesian and Cocceian views.