SB 10.12.38
naitad vicitram manujarbha-mayinah
paravaranam paramasya vedhasah
agho ’pi yat-sparsana-dhauta-patakah
prapatma-samyam tv asatam sudurlabham
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Krsna is the cause of all causes. The causes and effects of the material world, both higher and lower, are all created by the Supreme Lord, the original controller. When Krsna appeared as the son of Nanda Maharaja and Yasoda, He did so by His causeless mercy. Consequently, for Him to exhibit His unlimited opulence was not at all wonderful. Indeed, He showed such great mercy that even Aghasura, the most sinful miscreant, was elevated to being one of His associates and achieving sarupya-mukti, which is actually impossible for materially contaminated persons to attain.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The word maya is also used in connection with love. Out of maya, love, a father has affection for his child. Therefore the word mayinah indicates that Krsna, out of love, appeared as the son of Nanda Maharaja and assumed the form of a human child (manujarbha). Krsna is the cause of all causes. He is the creator of cause and effect, and He is the supreme controller. Nothing is impossible for Him. Therefore, that He enabled even a living being like Aghasura to attain the salvation of sarupya-mukti was not at all wonderful for Krsna. Krsna took pleasure in entering the mouth of Aghasura in a sporting spirit along with His associates. Therefore, when Aghasura, by that sporting association, as maintained in the spiritual world, was purified of all contamination, he attained sarupya-mukti and vimukti by the grace of Krsna. For Krsna this was not at all wonderful.