The idea is by chanting Hare Kṛṣṇa mantra, we become free from the reaction of sinful life, but that does not mean we shall again indulge in sinful life and counteract it by chanting Hare Kṛṣṇa mantra. No. Not like that. Once you take to Hare Kṛṣṇa mantra, you should make rapid progress, without committing any sinful activity, and retard the progress. Don't do that. Go on.
Pradyumna: "There is another evidence in the Fourth Canto of Śrīmad-Bhāgavatam, Twenty-second Chapter, 37th verse, wherein Sanat-kumāra says: 'My dear King, the false ego of a human being is so strong that it keeps him in material existence as if tied up by a strong rope. Only the devotees can cut off the knot of this strong rope very easily, by engaging themselves in Kṛṣṇa consciousness. Others, who are not in Kṛṣṇa consciousness but are trying to become great mystics or great ritual performers, cannot advance like the devotees.