"I found time to ask [Franz Marc] about these [German Expressionist] artistic endeavors in Germany, the subject of an impassioned conflict for some time before the war. Because of my professional activity in America in the years preceding the war, I had almost no contact with German artists. Thus I had never seen any paintings by Marc or by his friend August Macke, whose death at the beginning of the war had deeply distressed Marc.. .I never had the opportunity to express to this master how deeply the spirit of his unique art moved me. What fantasy and, at the same time, what logical constructions could be discerned in Marc's creations - how consistent this development had been from his impressionist beginnings to the abstract compositions of his last years!"
January 1, 1970
https://en.wikiquote.org/wiki/Franz_Marc