Tooting, howling, screeching, booming, crashing, whistling, grinding, and trilling bolster his [mankind's] ego. His anxiety subsides. His inhuman void spreads monstrously like a gray vegetation.

I use very little red. I use blue, yellow, a little green, but especially... black, white and grey. There is a certain need in me for communication with human beings. Black and white is writing.

All things, and man as well, should be like nature, without measure.

I allow myself to be guided by the work which is in the process of being born. I have confidence in it. I do not think about it.

To be full of joy when looking at an oeuvre is not a little thing.

Ever since my childhood, I was haunted by the search for perfection. An imperfectly cut paper literally made me ill. I would guillotine it.

We do not wish to imitate nature, we do not wish to reproduce. We want to produce. We want to produce the way a plant produces its fruit, not depict. We want to produce directly, not indirectly. Since there is not a trace of abstraction in this art we call it concrete art.