Understanding Krishna's transcendental nature through devotion liberates the soul from material rebirth forever.Listen — Srila Prabhupada Uvaca
Prabhupāda: janma karma [ca] me divyam [evaṃ] yo vetti tattvataḥ tyaktvā dehaṃ punar janma naiti mām eti kaunteya [Bg 4.9] [One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.] Lord Kṛṣṇa says that "The process of My birth and the process of My activities, they are all transcendental." And anyone who can understand the transcendental activities, appearance, disappearance of the Supreme Personality of Godhead, then the result is that tyaktvā dehaṃ punar janma naiti mām eti kaunteya. The result is that anyone who understands these transcendental activities of the Supreme Lord, tattvataḥ in truth, the result is that he becomes a liberated person. Tyaktvā deham. Tyaktvā means by quitting, by giving up this present material body, he at once is transferred to the spiritual world.
Tyaktvā dehaṃ punar janma naiti [Bg 4.9]. He does not require to come back here in this material world to have this material body. He at once develops his own spiritual body just like Kṛṣṇa. This is the process.
Simply by understanding the transcendental activities and the appearance and disappearance, he becomes fully spiritualized, and the result is that he at once... He does not get; the spiritual body is already existing. I am spirit; I have got my spiritual body, but that body is now covered by this matter. So by understanding the transcendental activities of Śrī Kṛṣṇa, by Kṛṣṇa consciousness, one can become liberated. And what is the result of that liberation?
That is also spoken in the Eighth Chapter of Bhagavad-gītā. The Lord says, mām upetya kaunteya: "My dear Arjuna, Kaunteya, son of Kuntī, please note it that mām upetya, anyone who comes to Me," mām upetya kaunteya duḥkhālayam aśāśvataṃ nāpnuvanti [Bg 8.15], "that he does not come again to this material world, which is duḥkhālayam, duḥkhālayam, a place of misery." [After attaining Me, the great souls, who are yogīs in devotion, never return to this temporary world, which is full of miseries, because they have attained the highest perfection.] This material world is certified by the Supreme Personality of Godhead as the place of misery. Now, if this place is made for that purpose, just to give us miseries only, how you can make it a place of happiness? The place is meant for that purpose.
So Lord Kṛṣṇa says that "Somebody, anybody who comes back to Me, he hasn't got to come back again to this place of miseries." Tyaktvā dehaṃ punar janma naiti mām eti [Bg 4.9]. [One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.] And again He says, mām upetya kaunteya duḥkhālayam aśāśvatam [Bg 8.15]: "This place is full of miseries." We are deluded, illusioned. We are accepting this place as permanent settlement. We are making plans, so many plans, to make a permanent settlement, but the Lord says it is not only full of misery; aśāśvatam, you cannot remain here permanently. However make your plan to live here permanently, you cannot live here.
You have to give up. You can spoil your energy for making this material world very comfortable, or you may live for some years very comfortably, but cruel death will come and snatch you from all comfortable position and put you into another position which is beyond your control. You cannot say that "I have made my position very secure. I am very comfortable with great endeavor by advancement of economic development, by advancement of material science. Let me remain here.
I am very happy." The time will say, "No, that will not be allowed. You must leave immediately, immediately, without delay." You know your President Kennedy. He was going in a procession, and the time came, and he had to leave everything at once, at once, without any hesitation. You cannot hesitate. So we are in the grip of the material nature.