Brahmanas and ksatriyas protect each other, as well as themselves, and the Lord protects them through each other

Expressions researched:
"brahmanas and ksatriyas protect each other, as well as themselves"

SB Canto 3

The brāhmaṇas are said to the Lord's heart and the kṣatriyas His arms. 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.

SB 3.22.3, Translation and Purport:

For the protection of the brāhmaṇas, the thousand-legged Supreme Being created us, the kṣatriyas, from His thousand arms. Hence the brāhmaṇas are said to be His heart and the kṣatriyas His arms.

Kṣatriyas are specifically meant to maintain the brāhmaṇas because if the brāhmaṇas are protected, then the head of civilization is protected. Brāhmaṇas are supposed to be the head of the social body; if the head is clear and has not gone mad, then everything is in proper position. The Lord is described thus: namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca. The purport of this prayer is that the Lord specifically protects the brāhmaṇas and the cows, and then He protects all other members of society (jagad-dhitāya). It is His will that universal welfare work depends on the protection of cows and brāhmaṇas; thus brahminical culture and cow protection are the basic principles for human civilization. Kṣatriyas are especially meant to protect the brāhmaṇas, as is the supreme will of the Lord: go-brāhmaṇa-hitāya ca. As, within the body, the heart is a very important part, so the brāhmaṇas are also the important element in human society. The kṣatriyas are more like the whole body; even though the whole body is bigger than the heart, the heart is more important.

SB 3.22.4, Translation and Purport:

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.

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 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 institution of four varṇas and four āśramas. If the members of different āśramas and varṇas cooperate fully in Kṛṣṇa consciousness, then society is well protected by the Lord, without doubt.