Answer: There is nothing selfless in the corporeal world because everything is based on egoism; it is the basis of our nature. Therefore, there is no need to have our heads in the clouds.
Nature is entirely arranged only on the egoistic principle—the desire to enjoy. But the fact is that with the help of the upper Light, that is, the influence of the Creator, we can rise above our nature and begin to use it differently—for the benefit of others. We as if rise above the Earth, overcome its gravity, but only with the help of the upper Light.
From the Kabbalah Lesson in Russian 4/29/18