CC Madhya 5.23
kṛṣṇa-prītye kari tomāra sevā-vyavahāra
“Sir, I am not a suitable bridegroom for your daughter. I render service to you only for the satisfaction of Kṛṣṇa.
Both brāhmaṇas were pure Vaiṣṇavas. The younger man took special care of the older one simply to please Kṛṣṇa. In Śrīmad-Bhāgavatam (11.19.21) Kṛṣṇa says, mad-bhakta-pūjābhyadhikā: “It is better to render service to My devotee.” Thus, according to the Gauḍīya-Vaiṣṇava philosophy of Caitanya Mahāprabhu, it is better to be a servant of the servant of God. One should not try to serve Kṛṣṇa directly. A pure Vaiṣṇava serves a servant of Kṛṣṇa and identifies himself as a servant of a servant of Kṛṣṇa. This is pleasing to Lord Kṛṣṇa. Śrīla Narottama dāsa Ṭhākura confirms this philosophy: chāḍiyā vaiṣṇava-sevā nistāra peyeche kebā. Unless one serves a liberated Vaiṣṇava, he cannot attain liberation by directly serving Kṛṣṇa. He must serve the servant of Kṛṣṇa.