बाहुभ्योऽवर्तत क्षत्रं क्षत्रियस्तदनुव्रत: । यो जातस्त्रायते वर्णान् पौरुष: कण्टकक्षतात् ॥ ३१ ॥
bāhubhyo ’vartata kṣatraṁ kṣatriyas tad anuvrataḥ yo jātas trāyate varṇān pauruṣaḥ kaṇṭaka-kṣatāt
Thereafter, from the arms of the Lord’s virāṭ form arose the power of protection; following that principle, the kṣatriyas came forth to shield society from thieves and miscreants.
As the brāhmaṇas are recognized by their particular qualification of inclination towards the transcendental knowledge of Vedic wisdom, so also the kṣatriyas are recognized by the power to protect society from the disturbing elements of thieves and miscreants. The word anuvrataḥ is significant. A person who follows the kṣatriya principles by protecting society from thieves and miscreants is called a kṣatriya, not the one who is simply born a kṣatriya. The conception of the caste system is always based on quality and not on the qualification of birth. Birth is an extraneous consideration; it is not the main feature of the orders and divisions. In Bhagavad-gītā (18.41-44) the qualifications of the brāhmaṇas, kṣatriyas, vaiśyas and śūdras are specifically mentioned, and it is understood that all such qualifications are needed before one can be designated as belonging to a particular group.
This verse states that the Kṣatriya arises with the mandate of kṣatra (ruling power) and must protect all varṇas from harm—symbolized as injuries from “thorns,” i.e., disruptive and unrighteous forces.
Śukadeva Gosvāmī speaks this verse while describing how the universal form gives rise to the functions and orders that sustain dharma in the world.
It teaches that leadership is meant for protection and service—using strength and authority to reduce harm, uphold justice, and safeguard the well-being of the whole community.