Christianity played such a central part in Vincent's life in Dordrecht that he often attended three different services on a Sunday, at churches including the Grote Kerk. An old friend of his father’s, Petrus Marinus Keller van Hoorn (1825–1908), was the minister there. Vincent visited him at home occasionally – once, on 16 February 1877, with his father – and he asked Keller van Hoorn’s advice on studying theology. The minister apparently advised him against it, as he lacked the necessary preliminary training.
Vincent often wrote to his brother Theo about the subjects of sermons he had heard in the Grote Kerk. Thus, for instance, we know that he heard Keller van Hoorn’s reflections on the scriptural passages “I come to do thy will, O God” (Heb 10: 7–9) and “He that loveth not knoweth not God; for God is love” (1 John 4: 8). Vincent liked the area around the Grote Kerk and invariably passed through it when he took walks in the city.