In brief, the beings in the universe can each live individually and alone. A tree can......
Translated
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[Extract from a talk of 'Abdu'l‑Bahá]
In brief, the beings in the universe can each live individually and alone. A tree can grow and develop by itself, without the assistance of other trees. Likewise, animals can live a solitary existence. But this is impossible for man. Humankind is in need of mutual aid and cooperation, of interaction and association, that it may obtain happiness and well-being and achieve comfort and harmony.
---'Abdu'l‑Bahá