No shadow without light
Human nature is closely connected with mother nature. However, the social structures we have created throughout history allow us to live without having to use instinct any more, because today's world is increasingly disconnected from what was before man became civilized and demanded use.
This has led to a profound change in our perception of nature, so Heidegger reminds us that the sun and the wind are fundamentally perceived as sources of energy to be used, the soil is only what covers the subsoil for the wealth it contains, the forest is a timber reserve.
Anyway, just as light and shadow are physically perceived, in the same way they are perceived as manifestations of the soul.
So, behind every dark action there is always an illumination that eventually leads to a return to the origins and consequently a return to nature.