CC Madhya 25.29

harer nāma-ślokera yei karilā vyākhyāna
sei satya sukhadārtha parama pramāṇa
Synonyms: 
harer nāma-ślokera — of the verse beginning harer nāma harer nāma; yei — whatever; karilā — made; vyākhyāna — the explanation; sei — that; satya — true; sukha-da-artha — a meaning that is pleasing to accept; parama pramāṇa — the supreme evidence.
Translation: 
“Śrī Caitanya Mahāprabhu’s explanation of the verse beginning ‘harer nāma harer nāma’ is not only pleasing to the ear but is strong, factual evidence.