Although he was considered one of the best youngsters of his year he failed to get his teaching certificate as a primary school teacher in April 1894.
In October he successfully retook the exams and started in January 1895 as a teacher at the public primary school in Alphen aan den Rijn.
He took the school children on long nature walks advocated this form of pedagogy during meetings of teachers from the Oude Rijn area.
This interest nature led him to resist the existing form of Christian education, and more generally the social relations in society.
The Calvinist dominance in the local area led the municipalities to marginalize public primary education.