Returning to the Eternal Religion
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na ced ihaivāpacitiṁ yathāṁhasaḥ kṛtasya kuryān mana-ukta-pāṇibhiḥ dhruvaṁ sa vai pretya narakān upaiti ye kīrtitā me bhavatas tigma-yātanāḥ
“Yes, I’ve already described the different types of hellish conditions and very severe painful life, but one has to counteract it.” [ Bhāg.  6.1.7]
How can this be done? Sinful activities are committed in various ways. We can commit sinful activity or thus make a plan, thinking, “I shall kill that man.” Either way, it is sinful. When the mind is thinking, feeling, and willing, then there is action.
The other day I was reading in a book that if someone’s dog barks at you when you are passing on the road, then that is an offense on the part of the dog-owner, according to law. No one should have to be scared by dogs barking, so one should take care of his dog. I read this. It is a law in your country. The dog is simply barking, but it is sinful. The dog is not responsible, because it is an animal, but because the owner of the animal has made the dog his best friend, he is responsible by law. If an outside dog enters your house, it may not be killed, but the owners of the dog may be prosecuted.
Just as the barking of the dog is unlawful, so when you speak something offensive to others, that is also sinful. That is just like barking. Therefore sinful activities are committed in so many ways. Whether we think of sinful activities, or we speak something sinful, or we actually commit a sinful activity, they are all considered sinful activities.  Dhruvaṁ sa vai pretya narakān upaiti.  One has to suffer punishment for such sinful activities.
People do not believe in a next life because they want to avoid this botheration. But we cannot avoid it. We must act according to the law, or we will be punished. Similarly, I cannot avoid God’s law. That is not possible. I can cheat others, commit theft, and hide myself, thereby saving myself from the punishment of the state law, but I cannot save myself from the superior law, the law of nature. It is very difficult. There are so many witnesses. The daylight is witness, the moonlight is witness, and Kṛṣṇa is the supreme witness. You cannot say, “I am committing this sin, but no one can see me.”
Kṛṣṇa is the supreme witness sitting within your heart. He notes down what you are thinking and what you are doing. He also gives facility. If you want to do something to satisfy your senses, Kṛṣṇa gives the facility for that action. That is stated in the  Bhagavad-gītā .  Sarvasya