So by chance, when Caitanya Mahāprabhu was touring in South India . . . the Purāṇa, Śiva Purāṇa or something like that, it is stated there. And He brought the evidence again that, "Here you see, in the Purāṇa it is said that when Rāvaṇa came to kidnap Sītā, immediately a false Sītā was given to him, and the real Sītā disappeared. Then again, when Lord Rāmacandra, after killing Rāvaṇa, He was accepting Sītā back to home, He tested with fire that, 'Sītā, you should enter the fire, and if you are not burned, then you are chaste. Otherwise you are not chaste.' Yes. So the false Sītā which was taken by Rāvaṇa, she entered the fire, and the real Sītā came out." This is the statement in the śāstra.
So things take place like that. The queens of Kṛṣṇa, they could not be touched. But it is a play only. Similarly, Yadu dynasty, the descendants of Kṛṣṇa, they also could not be killed. But . . . just like Kṛṣṇa was killed by the arrow of a hunter. How Kṛṣṇa can be killed? But it is for the person . . . for the demons, to demonstrate like that, who thinks Kṛṣṇa as ordinary human being. So for them it is a jugglery. They will still know that "Here your Kṛṣṇa is killed." Yes. They will say like that. So tān ahaṁ dviṣataḥ krūrān kṣipāmy ajasram asura-yoniṣu (BG 16.19).
The demons, as they want to forget Kṛṣṇa, or they do not like to understand Kṛṣṇa as the Supreme Personality of Godhead, Kṛṣṇa plays something like that so that they will be more convinced that Kṛṣṇa is not God, Kṛṣṇa is ordinary human being. Tān ahaṁ dviṣataḥ krūrān. They will remain in darkness forever. Kṛṣṇa gives chance to everyone. If you want to forget Kṛṣṇa, Kṛṣṇa will give you such intelligence, you will talk so intelligently that, "Kṛṣṇa is not God." Ye yathā māṁ prapadyante (BG 4.11). And if you want to know Kṛṣṇa, then He will give you such intelligence you will know that, "Here is Supreme Personality of Godhead." This is Kṛṣṇa's busin . . . if you want to forget Kṛṣṇa, Kṛṣṇa will give you chance to forget Him forever. And you suffer. Because forgetting Kṛṣṇa, one is not benefited. By knowing Kṛṣṇa is one benefited. But the demons, rākṣasas, they suffer, and still they want to forget Kṛṣṇa. This is their business.
So now the most important thing is that Kṛṣṇa made this plan to kill His descendants. He did not like that they should . . . but who will kill them? That is the problem. They are descendants of Kṛṣṇa. Who will kill them? Therefore it was Kṛṣṇa's plan that they will kill themselves. If others come to kill Kṛṣṇa's descendant, then what is the value of Kṛṣṇa's descendant? Nobody could kill, because in Kṛṣṇa's presence, whenever there was fight, all the descendants they came out. And who will conquer them? Nobody. That is not possible. But Kṛṣṇa wanted that before His going away, all these demigods, they must also return. "Return" means this body must be killed. But who will kill them? That was the plan of Kṛṣṇa. Therefore Kṛṣṇa is . . . Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati (BG 18.61). He is planning. He made this plan.