We have to discriminate, "Whether I am working for sense gratification or whether I am working for the satisfaction of the Supreme?" If this art we can learn, then our life becomes spiritualized. Spiritual life does not mean that we have to change something of these activities which we are, already we are engaged, or our form of the body will change to something extraordinary. Nothing. The same body, the same feature, the same activity, same engagement—everything same.
But we have to know the art, "Whether these activities are being done from the spiritual platform or from the material platform?" If we can discriminate in that way, as Lord Kṛṣṇa advises Arjuna, dūreṇa hy avaraṁ karma buddhi-yogād dhanañjaya: "O Dhanañjaya . . ." Dhanañjaya is the another name of Arjuna. "My dear Dhanañjaya, buddhi-yogāt, by your intelligence . . ." And as we have explained, buddhi-yoga means devotional service to the Lord.
So on the criterion of buddhi-yoga, on the criterion of devotional service to the Lord, you have to do everything. That is the, I mean to say, technique. That is the technique. Dūreṇa hy avaraṁ karma buddhi-yogāt. Buddhi-yogāt. You have to use your intelligence, "Whether I am doing this on the platform of pure consciousness or on the platform of this body?"
Now, in the beginning you require a guide. Without guide, it is not possible. Anything which you want to learn in the beginning, any art or science, you require a guide. Without guide . . . just like a small child, when he begins to walk, he requires the help of his elder brother or sister or father or mother to catch, and one step, one step, one step, one step . . . but when he begins to walk independently, then he doesn't require any help. Similarly, to learn this art, "Whether I am acting on the spiritual platform or on the material platform?" you require a spiritual master, guide. And this is called dvija, or the second birth. When you catch hold of the bona fide spiritual master just to guide you to act on the spiritual platform, then your second life begins. It is called dvija.