"I work a lot and I think a lot. I really want to try to paint on glass. .Please will you ask him if there are any transparent colors, which one can use to paint on the glass directly.. .I want to dispose of a new technique in which the artist can paint on the glass directly instead of canvas. When one wants to reach colors spiritually-bright, then a time will come that oil-paint and canvas are no longer suitable.. .So, if you have time, please ask Mr. Taut if he understands my view and maybe he knows the ways how I can follow my direction."

“As an artist you can not stand for long in The Netherlands. You must see a lot and talk a lot about everything..”

“The country is very beautiful and painterly one see stimulating color tones; but the more abstract one works, the more one transforms the sketch into combinations.”

“' Jacoba van Heemskerck - A Rediscovery; exhibition-text of the Gemeentemuseum The Hague, August - Nov. 2005”

“Jacoba van Heemskerck, in the RKD Archive, The Hague, only in Dutch language”

“I got the idea to paint people, in the way I see them. From one face I take to my own idea some very characteristic features of it and then I make of the whole a picture in colors and lines, in the way how I meet that person. The whole thing becomes not at all a portrait in the usual sense.. .I have tried to make types, but will built in more and more personal qualities and all that kind of things.. .Everything will be figured out fully abstract of course, it is just a personal feeling and no system at all.”

“All men forget that colors have to radiate to give the big expression.”