CC Madhya 19.192

punaḥ kṛṣṇa-rati haya duita prakāra
aiśvarya-jñāna-miśrā, kevalā-bheda āra
Word for word: 
punaḥ — again; kṛṣṇa-rati — attachment for Kṛṣṇa; haya — becomes; duita — twofold; prakāra — varieties; aiśvarya-jñāna-miśrā — knowledge of Kṛṣṇa mixed with a reverential attitude; kevalā — pure attachment; bheda — division; āra — other.
Translation: 
“Attachment for Kṛṣṇa is divided into two categories. One is attachment with awe and reverence, and the other is pure attachment without reverence.