CC Madhya 24.182
kṛṣṇa-bhakta — a devotee of Lord Kṛṣṇa; duḥkha-hīna — not under miserable material conditions; vāñchā-antara-hīna — he has no desire other than to serve Kṛṣṇa; kṛṣṇa-prema — love of Kṛṣṇa; sevā — service; pūrṇa-ānanda — full in transcendental bliss; pravīṇa — and very expert or experienced in all subject matters.
“A devotee of Kṛṣṇa is never in a miserable condition, nor does he have any desire other than to serve Kṛṣṇa. He is experienced and advanced. He feels the transcendental bliss of love of Kṛṣṇa and always engages in His service in full perfection.