As soon as he (the devotee firmly fixed in devotional service) remembers Lord Visnu, his eyes fill with tears. This is a symptom of a maha-bhagavata

Expressions researched:
"as soon as he remembers Lord Viṣṇu, his eyes fill with tears. This is a symptom of a mahā-bhāgavata"

Srimad-Bhagavatam

SB Canto 5

When a person is firmly fixed in devotional service to the Supreme Personality of Godhead, he is described as vīra-vrata, fully determined. Such a devotee increases his ecstasy in devotional service more and more. Thus as soon as he remembers Lord Viṣṇu, his eyes fill with tears. This is a symptom of a mahā-bhāgavata. Dhruva Mahārāja maintained himself in that devotional ecstasy, and Śrī Caitanya Mahāprabhu also gave us a practical example of transcendental ecstasy when He lived at Jagannātha Purī. His pastimes there are fully narrated in Caitanya-caritāmṛta.

SB 5.17.2, Translation and Purport

Dhruva Mahārāja, the famous son of Mahārāja Uttānapāda, is known as the most exalted devotee of the Supreme Lord because of his firm determination in executing devotional service. Knowing that the sacred Ganges water washes the lotus feet of Lord Viṣṇu, Dhruva Mahārāja, situated on his own planet, to this very day accepts that water on his head with great devotion. Because he constantly thinks of Kṛṣṇa very devoutly within the core of his heart, he is overcome with ecstatic anxiety. Tears flow from his half-open eyes, and eruptions appear on his entire body.

When a person is firmly fixed in devotional service to the Supreme Personality of Godhead, he is described as vīra-vrata, fully determined. Such a devotee increases his ecstasy in devotional service more and more. Thus as soon as he remembers Lord Viṣṇu, his eyes fill with tears. This is a symptom of a mahā-bhāgavata. Dhruva Mahārāja maintained himself in that devotional ecstasy, and Śrī Caitanya Mahāprabhu also gave us a practical example of transcendental ecstasy when He lived at Jagannātha Purī. His pastimes there are fully narrated in Caitanya-caritāmṛta.