March 27

Throughout this endless universe, the greatest means for the progress and renewal of existence is that all things are eaters and eaten.  This is a condition that applies to all the particles of the universe, and it is through this means that created things are renewed, transformed into one another, and endowed with a new reality unlike the previous one.  And this indeed is the means of renewal.

For instance, in the mineral kingdom the soil absorbs the air and the water and decomposes the creatures within it, and thus enables the existence of plants.  The more microscopic animals exist in the soil, the better the plants will grow.  And when the plant has grown, it is consumed by the animal, is incorporated in its body, and is endowed with a new existence.  Thus it progresses further and assumes a higher reality than that which it initially possessed.  This indeed is the means of progress and renewal from the mineral to the vegetable, from the vegetable to the animal, and from the animal to the human world. 
- ‘Abdu’l-Baha  (From a talk, new resources prepared by the Baha’i World Center, 2019; Baha’i Reference Library)