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Śrīmad-Bhāgavatam
[Canto 3, Ch. 22]
rakṣati smāvyayo devaḥ sa yaḥ sad-asad-ātmakaḥ
ataḥ —hence;  hi —certainly;  anyonyam —each other;  ātmānam —the self;  brahma —the  brāhmaṇas ;  kṣatram —the  kṣatriyas ;  ca —and;  rakṣataḥ —protect;  rakṣati sma —protects;  avyayaḥ —immutable;  devaḥ —the Lord;  saḥ —He;  yaḥ —who;  sat-asat-ātmakaḥ —the form of the cause and effect.
TRANSLATION
That is why the  brāhmaṇas  and  kṣatriyas  protect each other, as well as themselves; and the Lord Himself, who is both the cause and effect and is yet immutable, protects them through each other.
PURPORT
The entire social structure of  varṇa  and  āśrama  is a cooperative system meant to uplift all to the highest platform of spiritual realization. The  brāhmaṇas  are intended to be protected by the  kṣatriyas , and the  kṣatriyas  also are intended to be enlightened by the  brāhmaṇas . When the  brāhmaṇas  and  kṣatriyas  cooperate nicely, the other subordinate divisions, the  vaiśyas , or mercantile people, and the  śūdras , or laborer class, automatically flourish. The entire elaborate system of Vedic society was therefore based on the importance of the  brāhmaṇas  and  kṣatriyas . The Lord is the real protector, but He is unattached to the affairs of protection. He creates  brāhmaṇas  for the protection of the  kṣatriyas , and  kṣatriyas  are created for the protection of the  brāhmaṇas . He remains aloof from all activities; therefore, He is called  nirvikāra , without activity. He has nothing to do. He is so great that He does not perform action personally, but His energies act. The  brāhmaṇas  and  kṣatriyas , and anything that we see, are different energies acting upon one another.
Although individual souls are all different, the Superself or Supersoul is the Supreme Personality of Godhead. Individually one's self may differ from others in certain qualities and may engage in different activities, such as those of a  brāhmaṇa ,  kṣatriya  or  vaiśya , but when there is complete cooperation among different individual souls, the Supreme Personality of Godhead as Supersoul, Paramātmā, being one in every individual soul, is pleased and gives them all protection. As stated before, the  brāhmaṇas  are produced from the mouth of the Lord, and the  kṣatriyas  are produced from the chest or arms of the Lord. If the different castes or social sections, although apparently differently occupied in different activities, nevertheless act in full cooperation, then the Lord is pleased. This is the idea of the