The spiritual world is the "exact counterpart" of the material world

The spiritual world is like unto the phenomenal world. They are the exact counterpart of each other. Whatever objects appear in this world of existence are the outer pictures of the world of heaven. 

- ‘Abdu’l-Baha  (From a talk, 13 April 1912, New York; ‘The Promulgation of Universal Peace: Talks Delivered by ‘Abdu’l-Bahá during His Visit to the United States and Canada in 1912’)

The simultaneous “operation of two divine names”: - “Quickener” and “Destroyer”

O maidservant of God! Strive that thou mayest not be deprived of the effulgent splendours of His lights, nor far removed from the shadow of His mercy. Take thou refuge in His shelter, and abide thou beneath the shadow of His gracious favour; for all that cometh not beneath His shadow hath ever been, and shall remain, within the realm of disbelief. In these days, the operation of two divine names may be witnessed with the utmost clarity, to wit, the names of “Quickener” and “Destroyer”. These cause on the one hand death, and on the other, life. The one taketh life away from those that turn away from God; the other conferreth everlasting life upon those that turn towards Him. How great the power of Him Who at a single time hath made two seasons to appear: spring and autumn! How numerous the trees of human souls that have become fresh and verdant in this mystic, holy springtide, and richly laden with the fruits of divine knowledge! And how numerous the trees of human souls that have become parched and withered in this same season, deprived of all God’s manifold bestowals! A single breeze blew forth from out His peerless Paradise: To the believers in the unity of God it was a balm of peace and mercy; to the infidels, a blast of wrath and chastisement. Such is the power of Him Who is the sovereign Lord of all! 

- Baha’u’llah  (‘Additional Tablets and Extracts from Tablets Revealed by Bahá’u’lláh’; Baha’i Reference Library of the Baha’i World Center)

“the food of man is cereals and fruit. …he is not in need of meat, nor is he obliged to eat it.”

Regarding the eating of animal flesh and abstinence therefrom, know thou of a certainty that, in the beginning of creation, God determined the food of every living being, and to eat contrary to that determination is not approved. For instance, beasts of prey, such as the wolf, lion and leopard, are endowed with ferocious, tearing instruments, such as hooked talons and claws. From this it is evident that the food of such beasts is meat. If they were to attempt to graze, their teeth would not cut the grass, neither could they chew the cud, for they do not have molars. Likewise, God hath given to the four-footed grazing animals such teeth as reap the grass like a sickle, and from this we understand that the food of these species of animal is vegetable. They cannot chase and hunt down other animals. The falcon hath a hooked beak and sharp talons; the hooked beak preventeth him from grazing, therefore his food also is meat.

But now coming to man, we see he hath neither hooked teeth nor sharp nails or claws, nor teeth like iron sickles. From this it becometh evident and manifest that the food of man is cereals and fruit. Some of the teeth of man are like millstones to grind the grain, and some are sharp to cut the fruit. Therefore he is not in need of meat, nor is he obliged to eat it. Even without eating meat he would live with the utmost vigour and energy. For example, the community of the Brahmins in India do not eat meat; notwithstanding this they are not inferior to other nations in strength, power, vigour, outward senses or intellectual virtues. Truly, the killing of animals and the eating of their meat is somewhat contrary to pity and compassion, and if one can content oneself with cereals, fruit, oil and nuts, such as pistachios, almonds and so on, it would undoubtedly be better and more pleasing. 

- 'Abdu'l-Bahá  (From a Tablet; The Compilation of Compilations, vol. I, Some Aspects of Heath, Healing, Nutrition and Related Matters)