"Today You will probably not regret Vorden [by not being able to paint?], for today it is all raining, and although the weather is gentle, I fear that we will soon meet the real days of Autumn. I hope that your paintings will be transported well [from Vorden], and [I hope] especially that you will keep that warm hue in them, which is so beautiful present now. That must be terribly difficult, when a painting has reach a certain level, not to spoil it then: I hope that You will not go on painting it too long, because then You will start stripping it off again: - better to put it away in time. - Farewell now, Mr. Bilders.. (translation from Dutch, Fons Heijnsbroek)."
January 1, 1970
https://en.wikiquote.org/wiki/Johannes_Warnardus_Bilders