This whole universe works systematically, being controlled by the Supreme Life-Principle, the Supreme Brahman. The Upanishads state that none can transgress the rule of this Brahman. By fear of this Supreme Being, fire burns, the sun shines, Indra and Vayu perform their functions and death does its duty.
Krishna draws attention to the universal law that applies to human beings as well, who partake the natural benefits such as air, water, etc., pointed out Sri Jamadagni in a lecture. He highlights their moral responsibility to preserve the wealth of Nature which is offered to them. Nature helps with rains that in turn help the growth of plants and animals.
Performance of yagas and yagnas is recommended for the mutual interdependence between the sections of the multi-layered universe. These are sacrificial rituals involving propitiating the celestial beings through offerings made to Agni. Fire is seen as a deity who can carry the offerings of the human beings to the gods who in turn keep the world prosperous with rains that sustain life on earth. The celestial beings are sustained by the sacrificial offerings during yagnas.
Food sustains life and the rains are the cause of food. This is explained through the symbolic representation of the Vedas in scriptures as a tree which is upside down with roots high above and branches extending to the earth. Human beings draw their sustenance from these branches. Performance of yagas and yagnas by which fire and the gods are propitiated is the only means by which the roots situated above can be watered and the tree preserved. The phenomenal world is enveloped in the three gunas and bound by Time and Space. All creation manifested as Nature is in essence Brahma swaroopa. Following the dictates of the Vedas that have their source in the Brahman in the right spirit is considered to be on a par with the performance of a yaga.
