Derech Eretz דרך ארץ. Means defining and developing rational control of emotional drives/surges/currents which flow like a river within the soul of man. Human beings have their emotions at birth, but only develop rational thought much later in life. As such the emotional surges/swings that a person experiences, for non-Bnai Brit peoples, these control and direct the rational thought processes. I call it living within the Cave of many colors. The emotions create an environment whereby the mind reacts to this given environment and justifies decisions made based upon the given environment. People living in their cave remains cavemen barbarians irregardless of their cultural trappings of knowledge education and beauty.
Taking the Neshama/breath from the body takes conscious choice. Creating a world of דרך ארץ (Derech Eretz) from the Neshama makes the Bnai Brit person in the image of the Creator!