Śrīmad-Bhāgavatam 10.52.31
Blended reading (Sanskrit + English inline)
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santuṣṭaḥ
—
satisfied
Past participle of sam-√tuṣ (to be fully pleased). Santoṣa is the second yama in Patañjali's niyamas and the central brāhmaṇa-virtue across the Bhāgavatam. Gauḍīyas link santoṣa to bhakti-sukha — the bhakta is content because Kṛṣṇa is the wealth he already has.
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ahīyamānaḥ
—
not falling short
Present passive participle of a-√hā (to abandon, with negation). The brāhmaṇa does not fall away from dharma — even amid scarcity. Negative grammar marks the discipline: santoṣa is not the same as having; it is the not-abandoning.
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svāt-dharmāt
—
from his own religious duty
Phrase: sva (own) + dharma (duty), ablative. The technical phrase used in Gītā 18.45-47 — sva-dharma is what the verse hinges on. Generic spirituality is not in view; specific varṇa-aśrama duty is.
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akhila-kāma-dhuk
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(dharma is) the mystic cow milking-out all desires
Compound: akhila (all) + kāma (desire) + dhuk (one who is milked, from √duh). The kāma-dhuk image is technical Vedic vocabulary — it elevates the brāhmaṇa's santoṣa-based dharma to the rank of celestial cow.
If the brahmana is unwavering in his dharma (svatdharmat ahiyamanah) , that dharma (sah) yields all desires.
He praises satisfaction to praise the brāhmaṇa. When he is satisfied he does not deviate from dharma. Instead of yarhi sometimes yadi is seen. That satisfaction, and nothing else, fulfils all desires.
For the contented brāhmaṇa, dharma itself becomes a kāma-dhuk — the wish-fulfilling cow. The image is exact: santoṣa is the milking-hand; svadharma is the udder; whatever the brāhmaṇa needs flows of itself, without grasping. Bhagavān is teaching the messenger his own science before letting him deliver the message.
Vasiṣṭha's Nandinī (in the Mahābhārata's Ādi Parva, and at Rāmāyaṇa Bāla-kāṇḍa 51-56) is the celestial cow that produces all desires for the brāhmaṇa who keeps his dharma. King Viśvāmitra tried to seize her by force and was repulsed by her own power — proving that the cow yields only to santoṣa, never to grasping.
Kṛṣṇa's verse names dharma itself as that cow for the satisfied brāhmaṇa. Gauḍīyas read the lesson: the bhakta who serves with santoṣa never lacks; the one who grasps loses even what he already has.
My note
Source: vedabase.io