As soon as the Bhattacarya saw the King's firm determination, he declared, "The Supreme Lord is approached only by pure love. Your love for Sri Caitanya Mahaprabhu is very, very deep; therefore without a doubt He will be merciful upon you"

Expressions researched:
"The Supreme Lord is approached only by pure love. Your love for Śrī Caitanya Mahāprabhu is very, very deep; therefore without a doubt He will be merciful upon you"

Sri Caitanya-caritamrta

CC Madhya-lila

As soon as the Bhaṭṭācārya saw the King’s firm determination, he declared, “The Supreme Lord is approached only by pure love. Your love for Śrī Caitanya Mahāprabhu is very, very deep; therefore without a doubt He will be merciful upon you.”

CC Madhya 11.52, Translation and Purport

As soon as the Bhaṭṭācārya saw the King’s firm determination, he declared, “The Supreme Lord is approached only by pure love. Your love for Śrī Caitanya Mahāprabhu is very, very deep; therefore without a doubt He will be merciful upon you.”

Such determination is the first qualification. As confirmed by Rūpa Gosvāmī (Upadeśāmṛta 3): utsāhān niścayād dhairyāt. One must first have firm determination, firm faith. When one engages in devotional service, he must maintain this firm determination. Then Kṛṣṇa will be pleased with his service. The spiritual master can show the path of devotional service. If the disciple follows the principles rigidly and undeviatingly, he will certainly receive the mercy of Kṛṣṇa. This is confirmed by the śāstras.