He was attacked by two demons, Madhu and Kaiṭabha, who took away Vedic knowledge, but the Lord killed them and entrusted to Lord Brahmā the Vedic knowledge. Thus the Lord appears in every millennium in the societies of demigods, human beings, animals, saints and aquatics. All such incarnations are meant to protect the devotees and kill the demons, but this killing and protecting does not reflect any sense of partiality on the part of the Supreme Lord. The conditioned soul is always attracted by the external energy. Therefore he is subjected to lust and greed, and he suffers under the conditions of material nature. The Lord's causeless mercy toward His devotee is the only means by which to get out of material existence. Anyone engaged in glorifying the Lord's activities is always unafraid of this material world, whereas one who cannot glorify the Lord in that way is subjected to all lamentation.
Those interested in silently worshiping the Lord in solitary places may be eligible for liberation themselves, but a pure devotee is always aggrieved to see others suffering. Therefore, not caring for his own liberation, he always engages in preaching by glorifying the Lord. Prahlāda Mahārāja, therefore, had tried to deliver his class friends by preaching and had never remained silent. Although being silent, observing austerities and penances, learning the Vedic literature, undergoing ritualistic ceremonies, living in a solitary place and performing japa and transcendental meditation are approved means of liberation, they are meant for nondevotees or for cheaters who want to live at the expense of others. A pure devotee, however, being freed from all such deceptive activities, is able to see the Lord face to face.