CC Madhya 17.109

tāhā dekhi’ jñāna haya — ‘ei nārāyaṇa
yei tāṅre dekhe, kare kṛṣṇa-saṅkīrtana
Word for word: 
tāhā dekhi’ — seeing that; jñāna haya — one comes to the conclusion; ei nārāyaṇa — He is the Supreme Personality of Godhead, Nārāyaṇa Himself; yei — anyone who; tāṅre — Him; dekhe — sees; kare — performs; kṛṣṇa-saṅkīrtana — chanting of the holy name of Kṛṣṇa.
Translation: 
“When one sees all these features, one takes Him to be Nārāyaṇa Himself. Whoever sees Him immediately begins to chant the holy name of Kṛṣṇa.