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CC Madhya 23.39

yāṅra citte kṛṣṇa-premā karaye udaya
tāṅra vākya, kriyā, mudrā vijñeha nā bujhaya
Synonyms: 
yāṅra citte — in whose heart; kṛṣṇa-premā — love of Kṛṣṇa; karaye udaya — awakens; tāṅra — his; vākya — words; kriyā — activities; mudrā — symptoms; vijñeha — even a learned scholar; bujhaya — does not understand.
Translation: 
“Even the most learned man cannot understand the words, activities and symptoms of a person situated in love of Godhead.