"Forgive me of saying so, but good things just have to grow very slowly. I say this in connection with your [Van Doesburg's] plans.. ..for launching a journal. I do not think that the time is favourable for it. More must be achieved in art in that direction. I hardly know anyone who is really creating art in our style, in other words, art which has arrived.. ..you will have to include in it [in the new journal] what is not consistent with our ideas."
January 1, 1970