One who is successful, he enters into the kingdom of God. That is a different thing. But one who is a failed student, what happens to him? Now, prāpya puṇya-kṛtāṁ lokān: "He enters into the planet where pious living entities are allowed to enter." That means he gets into the higher planets.
There are many planets within the universe, and the higher planets, there are more comforts, more duration of life, persons are more pious, religious, godly. As you make progress to the higher planets, these facilities are there, thousand times better than this planet. So Kṛṣṇa says that, "Even if he is failure, still, he goes to such planets where pious men are elevated." Prāpya puṇya-kṛtāṁ lokān, and uṣitvā śāśvatīḥ samāḥ: and he remains there for a long duration of time.
Now, in the heavenly kingdom, it is said that our six months is . . . six months are equal to their one day. And similarly, they live there for ten thousand years. This description we get from Vedic literature. Just like in the Bhagavad-gītā you have got the duration of life of Brahmā. That is the highest planet. So Kṛṣṇa says that "After . . . even if he is a failure, he gets promotion to the higher planets." But in the higher planet you cannot remain for all the time. Kṣīṇe puṇya . . . kṣīṇe puṇya punaḥ martya-lokaṁ viśanti: "When your pious balance is finished, then you are again fallen in this earth." Kṣīṇe puṇye punaḥ martya-lokaṁ viśanti. Martya-lokam means, this martya-lokam, this earth.