SB 5.17.2
yatra ha vava vira-vrata auttanapadih parama-bhagavato ’smat-kula-devata-caranaravindodakam iti yam anusavanam utkrsyamana-bhagavad-bhakti-yogena drdham klidyamanantar-hrdaya autkanthya-vivasamilita-locana-yugala-kudmala-vigalitamala-baspa-kalayabhivyajyamana-roma-pulaka-kulako ’dhunapi paramadarena sirasa bibharti.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Dhruva Maharaja, the famous son of Maharaja Uttanapada, 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 Visnu, Dhruva Maharaja, situated on his own planet, to this very day accepts that water on his head with great devotion. Because he constantly thinks of Krsna 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.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When a person is firmly fixed in devotional service to the Supreme Personality of Godhead, he is described as vira-vrata, fully determined. Such a devotee increases his ecstasy in devotional service more and more. Thus as soon as he remembers Lord Visnu, his eyes fill with tears. This is a symptom of a maha-bhagavata. Dhruva Maharaja maintained himself in that devotional ecstasy, and Sri Caitanya Mahaprabhu also gave us a practical example of transcendental ecstasy when He lived at Jagannatha Puri. His pastimes there are fully narrated in Caitanya-caritamrta.