Caitanya-caritāmṛta 8.29-30
hena kṛṣṇa-nāma yadi laya bahu-bāra tabu yadi prema nahe, nahe aśrudhāratabe jāni, aparādha tāhāte pracura kṛṣṇa-nāma-bīja tāhe nā kare aṅkura
[hena krishna-naama yadi laya bahu-baara tabu yadi prema nahe, nahe ashrudhaaratabe jaani, aparaadha taahaate prachura krishna-naama-beeja taahe naa kare ankura]
Blended reading (Sanskrit + English inline)
hena kṛṣṇa-nāma yadi laya bahu-bāra tabu yadi prema nahe, nahe aśrudhāratabe jāni, aparādha tāhāte pracura kṛṣṇa-nāma-bīja tāhe nā kare aṅkura
If one chants the exalted holy name of the Lord again and again and yet his love for the Supreme Lord does not develop and tears do not appear in his eyes, it is evident that because of his offenses in chanting, the seed of the holy name of Kṛṣṇa does not sprout.
Purport
If one chants the Hare Kṛṣṇa mantra offensively, one does not achieve the desired result. Therefore one should carefully avoid the offenses, which have already been described in connection with verse 24.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io