"..that one [a tree study in Gabriël's studio] is from my early times; I don't make them that way anymore; look how the thing is painted..; and those days my teachers told me that nothing would come of me in this way. What kind of folks were they? [o.a. his early and short teacher Koekoek, c. 1844-45] And which guys belonged to them? Well, let's keep mum about that; all those guys are dead already. But those days [c. 1840's] it was the ruling idea to use nature only as a tool; she had to be embellished later with imagination and so on .... imagination .... the stupidest thing in the world. (L. de Haes asked him: Do you think imagination is so improper?) Improper, I think it is simply an unhealthy trait. You see; imagination is the proper way to insanity. Imagine that you start painting from your imagination without knowing nature; after all, there will be no result whatsoever. All those people of imagination imagine so much, and it is the greatest misfortune you can have in life, you know what it is good for: to idealize your faults. (translation from the Dutch original: Fons Heijnsbroek)"