Prabhupada's lecture - Śrīmad-Bhāgavatam 1.5.25 - Vṛndāvana, August 6, 1974
So many. There are different terms. So this is the process. We are eternally related with Kṛṣṇa, nitya-siddha kṛṣṇa-bhakti, and we're eternally very affectionate and obedient servant of Kṛṣṇa. That is our position. Somehow or other, it is covered. So that garbage that's covering has to be moved. Therefore Caitanya Mahāprabhu said, ceto-darpaṇa-mārjanam [Cc. Antya 20.12]. This is the process of cleansing the mirror of the heart. Mirror, when it is covered by dust you cannot see your face nicely. But as soon as it is nicely brushed and cleansed, you see exactly what you are.
Similarly, this Kṛṣṇa consciousness movement means cleansing the heart of all the dirty things that is accumulated life after life. It is not an artificial thing, we are learning to become devotee of Kṛṣṇa. We are already devotee of Kṛṣṇa, but we have forgotten, or the consciousness is covered. Now, by this process, devotional process, especially by kīrtana, by chanting, glorifying the holy name of the Lord, the cleansing process is accelerated. Very soon it takes place.