He became involved in religious controversies, supporting the liberal preacher Pontiaan van Hattem by publishing his leaflet De val van 's werelds afgod (The fall of the world's idol).
S-a implicat în controversele religioase, susținându-l pe preotul liberal Pontiaan van Hattem pentru care a publicat De val van 's werelds afgod (Căderea idolului lumii).