When I am painting, driven by lively tensions, I want to express what's going on in me. When that tension has ceased, when the life in me became visible, then something happened which had to happen. Over and over again you experience a work which is created in this way. What happened? It is hard to say, because it was not my mind that led but the inner desire that revealed its inner life.

Letter to H.P. Bremmer, 17-11-1930, City Archive The Hague, as quoted in: Bram van Velde, A Tribute, Municipal Museum De Lakenhal Leiden, Municipal Museum Schiedam, Museum de Wieger, Deurne 1994, p. 50 (English translation: Charlotte Burgmans)