Śrīla Prabhupāda Says

Regarding how every decision in life has it's do's and don’ts

     Asura-jana, those who are asuras, they do not know what to do and what not to do. Therefore one has to learn how to live, what to know, what to forget. Every... Every educational or progressive method has got do's and do not's. So the asuras, they do not know what they should do and what they should not do. That is asura. And a devotee, he knows what to do and what not to do.

    There is no illicit sex. That is "do not." But there is "do" also, that "If you want sex life, then get yourself married according to religious principle and get a wife and beget nice children." That is "do." And "No illicit sex," that is "do not." Side by side. "You do not take intoxicants"—that is "do not." But "You take Kṛṣṇa prasādam and be intoxicated with Kṛṣṇa's love"—that is "do." Similarly, "You do not indulge in gambling, but you indulge in gambling." What is that gambling? That gambling is "Dedicate your life to Kṛṣṇa and see the result." That is also gambling. That is also gambling, because everyone is engaged in his own business, but if he's advised, "You give up this business. You take to this Kṛṣṇa business," that is also gambling because he does not know what will happen.

   So everything has "do" and "do not." So we have to give up this "do not" and accept the "do," positive and negative. Then... Therefore, in the Tenth Chapter it is said, teṣāṁ satata-yuktānāṁ bhajatāṁ prīti-pūrvakam [Bhagavad-gita. 10.10]. By some way or other, who has become engaged in devotional service twenty-four hours, satata—satata means twenty-four hours—satata-yuktānāṁ, with faith—"Now I am engaged in Kṛṣṇa's service. Kṛṣṇa will be... Actually He'll be merciful upon me. He'll deliver me from this miserable condition of material life"—teṣāṁ satata-yuktānāṁ bhajatāṁ prīti-pūrvakam... [Bhagavad-gita. 10.10].

    So Kṛṣṇa is within. You cannot deceive Kṛṣṇa. That is not possible. Kṛṣṇa is the Supreme. If you are deceiver, Kṛṣṇa is also the supreme deceiver. And if you are lover, then Kṛṣṇa is the supreme lover. Ye yathā mām prapadyante tāṁs tathaiva bhajāmy ahaṁ [Bhagavad-gita. 4.11]. You deal with Kṛṣṇa. As you deal, He'll also... He reciprocates. That is Kṛṣṇa.

[Bhāgavad-gītā Lecture 2.39: London 12 Sept 1973]