Just like we change our dresses from one dress to another, similarly, this body to another body, transmigration of the soul. But we are meant for now completely ceasing to have any material body in the next life. That should be our aim of life. That is called . . . that knowledge is called the purest knowledge. Na hi jñānena sadṛśaṁ pavitram iha . . . that knowledge is the purest knowledge.
Tat svayaṁ yoga-saṁsiddhaḥ kālena ātmani vindati (BG 4.38). Now, by becoming Kṛṣṇa consciousness, by this yoga, bhakti-yoga, you can be successful. Yoga-saṁsiddhaḥ. And, in due course of time, you'll understand that, "Yes, I am in right path. Oh." In due course of . . . immediately you may be very doubtful, "Whether I have accepted the right path or not?" But in kālena, in due course, in due course of time, if you continue the process . . .
Therefore in the next verse it is stated, śraddhāvān labhate jñānam (BG 4.39). Śraddhāvān, one who is faithful, he can take up this knowledge. Faithful. Those who are hesitating, those who have no faith, oh, it is very difficult for them. We have to accept. Because the method is standard, and it is given by the highest authority, Kṛṣṇa, so we must have such faith, "Oh, here is a thing, authoritative." Just like faith in any transaction we have. We must have some faith.
Now, suppose if I go to California from here, from New York, now, I have purchased the ticket by, going by air. Now, I have got this faith that, "This company, this aeroplane company, will take me to there." Maybe there may be some accident, but on faith I accept it, "Yes, it will take me there." When we go to the barber shop, on faith we stretch our neck and the razor is going on. He may at once put into the neck. But you keep the faith, "Yes, we have got the faith he will not do that."
So without faith, we cannot make progress. If in ordinary dealings we have to accept faithfully something . . . who knows that this aeroplane will take me to California? It may go down to hell, in the oil. The, in the bus there may be some accident. In the railway there may be some accident. There is possibility. But on faith we accept. So if we want to make progress we must have faith.