CC Madhya 9.27

sei haite kṛṣṇa-nāma jihvāte vasilā
kṛṣṇa-nāma sphure, rāma-nāma dūre gelā
Word for word: 
sei haite — since that time; kṛṣṇa-nāma — the holy name of Lord Kṛṣṇa; jihvāte — on the tongue; vasilā — was seated tightly; kṛṣṇa-nāma — the holy name of Lord Kṛṣṇa; sphure — automatically comes; rāma-nāma — the holy name of Lord Rāmacandra; dūre — far away; gelā — went.
Translation: 
“Since then, the holy name of Kṛṣṇa has been tightly fixed upon my tongue. Indeed, since I have been chanting the holy name of Kṛṣṇa, the holy name of Lord Rāmacandra has gone far away.