CC Madhya 24.161

ei chaya yogī sādhu-saṅgādi-hetu pāñā
kṛṣṇa bhaje kṛṣṇa-guṇe ākṛṣṭa hañā
Synonyms: 
ei — this; chaya — six; yogī — mystics; sādhu — of devotees; saṅga-ādi — the association; hetu — because of; pāñā — getting; kṛṣṇa bhaje — render service to Kṛṣṇa; kṛṣṇa-guṇe — by the transcendental qualities of Kṛṣṇa; ākṛṣṭa — attracted; hañā — becoming.
Translation: 
“When a purified yogī associates with devotees, he engages in Lord Kṛṣṇa’s devotional service, being attracted by the Lord’s transcendental qualities.