SB 10.7.31
aho bataty-adbhutam esa raksasa
balo nivrttim gamito ’bhyagat punah
himsrah sva-papena vihimsitah khalah
sadhuh samatvena bhayad vimucyate
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is most astonishing that although this innocent child was taken away by the Raksasa to be eaten, He has returned without having been killed or even injured. Because this demon was envious, cruel and sinful, he has been killed for his own sinful activities. This is the law of nature. An innocent devotee is always protected by the Supreme Personality of Godhead, and a sinful person is always vanquished for his sinful life.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Krsna conscious life means innocent devotional life, and a sadhu is one who is fully devoted to Krsna. As confirmed by Krsna in Bhagavad-gita (9.30), bhajate mam ananya-bhak sadhur eva sa mantavyah: anyone fully attached to Krsna is a sadhu. Nanda Maharaja and the gopis and other cowherd men could not understand that Krsna was the Supreme Personality of Godhead playing as a human child and that His life was not in danger under any circumstances. Rather, because of their intense parental love for Krsna, they thought that Krsna was an innocent child and had been saved by the Supreme Lord.
In the material world, because of intense lust and desire for enjoyment, one becomes implicated in sinful life more and more (kama esa krodha esa rajo-guna-samudbhavah). Therefore the quality of fear is one of the aspects of material life (ahara-nidra-bhaya-maithunam ca). But if one becomes Krsna conscious, the process of devotional service, sravanam kirtanam, diminishes one’s polluted life of material existence, and one is purified and protected by the Supreme Personality of Godhead. srnvatam sva-kathah krsnah punya-sravana-kirtanah. In devotional life, one has faith in this process. Such faith is one of the six kinds of surrender. Raksisyatiti visvasah (Hari-bhakti-vilasa 11.676). One of the processes of surrender is that one should simply depend on Krsna, convinced that He will give one all protection. That Krsna will protect His devotee is a fact, and Nanda Maharaja and the other inhabitants of Vrndavana accepted this very simply, although they did not know that the Supreme Lord Himself was present before them. There have been many instances in which a devotee like Prahlada Maharaja or Dhruva Maharaja has been put in difficulty even by his father but has been saved under all circumstances. Therefore our only business is to become Krsna conscious and depend fully on Krsna for all protection.