Just like Śrīla Śukadeva Gosvāmī's described in the Bhagavad-gītā . . . Śrīmad-Bhāgavatam: itthaṁ brahma-sukhānubhūtyā dāsyaṁ gatānāṁ para-daivatena, māyāśritānāṁ nara-dārakeṇa kṛta-puṇya-puñjāḥ (SB 10.12.11). The boys who were playing with Kṛṣṇa, Śukadeva Gosvāmī says that after many, many births' accumulation of pious activities . . . because you cannot develop devotional service without pious life. Yeṣām anta-gataṁ pāpam. If you want to become associate with Kṛṣṇa, then you cannot act as a sinful man. Just like a criminal is not allowed to come out of the jail. He has no freedom. Similarly, if we act sinfully in this life, then we'll have to remain within this material world, one body after another.
So we, we have to give up sinful activities. Therefore we forbid our students: no illicit sex, no meat-eating, no gambling, no intoxication. Because these are the pillars of sinful life. So we have to give up these things to accelerate our promotion to devotional service. We cannot go on doing this and that at the same time. It is something like that you ignite fire and pour water. It will be useless attempt. If you want to burn the fire blazing, don't put water on it. Keep it dry. Similarly, if you want to advance in Kṛṣṇa consciousness, then you cannot indulge in sinful activities. And when you are proved that you are no more sinful, yeṣām anta-gataṁ pāpam, one who has become freed from the reaction of sinful life, yeṣām anta-gataṁ pāpaṁ janānāṁ puṇya-karmāṇi . . .
You have to do something. So if you engage yourself twenty-four hours in pious activities, pious activities in goodness, that is also tainted. But when you actually engage yourself in the devotional service of Vāsudeva, as we were discussing this morning, the verse, vāsudeve bhagavati bhakti-yogaḥ prayojitaḥ, janayaty āśu vairāgyam . . . (SB 1.2.7). So even if we are accustomed to sinful activities on account of bad habits, still, we can engage ourself in devotional service of Vāsudeva.
So those who are sincerely devotee of Vāsudeva sometimes, due to their past habits, may commit something sinful, not knowingly, but habituated; that is excused by Kṛṣṇa. Api cet su-durācāro bhajate mām ananya-bhāk (BG 9.30). But not willfully. Willfully if we commit some sinful activities, that can be excused once, twice, but not thrice. Then you'll be punished.
Therefore a devotee should not commit willfully any sinful activities in order to keep himself always fit in devotional service. He should try to keep himself steady, without committing any sinful actions. The primary sinful activities are described, and we try to follow. And if we chant sixteen rounds and keep ourself always aloof from the sinful activities, then it is certain, niścayāt, utsāhān dhairyāt, niścayāt tat-tat-karma-pravartanāt, sato vṛtteḥ sādhu-saṅge ṣaḍbhir bhaktiḥ prasidhyati (NOI 3).