The King of all Trees

It is like a great regal tree growing in the rocks and sand of a
barren wilderness. When the roots get water, the branches, leaves,
flowers, and fruits will all flourish. The regal Bodhi-tree growing in
the wilderness of birth and death is the same. All living beings are
its roots; all Buddha’s and Bodhisattvas are its flowers and fruits.
By benefiting all beings with the water of great compassion, one can
realize the flowers and fruits of the Buddha’s and Bodhisattvas
wisdom. Why is this? It is because by benefiting living beings with
the water of great compassion, the Bodhisattvas can achieve supreme
perfect enlightenment; therefore, Bodhi belongs to living beings.
Without living beings, no Bodhisattva could achieve supreme, perfect
enlightenment.

-From Samantabhadra Bodhisattva's Ninth Vow,
Avatamsaka Sutra, Chapter 40