Of This Men Shall Know Nothing (German: Von diesem wissen Männer nichts) is oil on canvas painting by a German painter, sculptor, graphic artist, and poet Max Ernst. The painting was completed in 1923 in Paris, France. It is created in a Surrealism style by use of symbolic painting genre during First French period. The painting measures 81 by 64 centimeters and is now housed at Tate Liverpool.^[1]

The painting shares several features with Silberer's diagram: its landscape setting and low horizon; the gradation of the sky from light at the bottom to dark at the top; and the inclusion of the Sun and the Moon. Ernst replaced the cube of Primal Matter with a pile of entrails.^[2] Elsewhere Ernst also employed alchemical motifs, such as in this painting of the sexual conjunction of Sun and Moon.^[3]