“Consider how the animal has attained the fullest degree of physical felicity. A bird perches upon the loftiest branch and builds there its nest with consummate beauty and skill. All the grains and seeds of the meadows are its wealth and food; all the fresh water of mountain springs and rivers of the plain are for its enjoyment. Truly, this is the acme of material happiness, to which even a human creature cannot attain. This is the honor of the animal kingdom. But the honor of the human kingdom is the attainment of spiritual happiness in the human world, the acquisition of the knowledge and love of God.”

– ‘Abdu’l-Bahá, The Promulgation of Universal Peace