CC Madhya 24.29

ei yāṅhā nāhi, tāhā bhakti — ‘ahaitukī’
yāhā haite vaśa haya śrī-kṛṣṇa kautukī
Synonyms: 
ei — these; yāṅhā — where; nāhi — not existing; tāhā — that; bhakti — the platform of devotional service; ahaitukī — unmotivated; yāhā haite — by which; vaśa haya — comes under control; śrī-kṛṣṇa — Lord Śrī Kṛṣṇa; kautukī — the most funny.
Translation: 
“Causeless devotional service is unmotivated by sense enjoyment, perfection or liberation. When one is freed from all these contaminations, he can bring Lord Kṛṣṇa, who is very funny, under control.