My Lord Nṛsiṁhadeva, O Supreme, because of a bodily conception of life, embodied souls neglected and not cared for by You cannot do anything for their betterment. Whatever remedies they accept, although perhaps temporarily beneficial, are certainly impermanent. For example, a father and mother cannot protect their child, a physician and medicine cannot relieve a suffering patient, and a boat on the ocean cannot protect a drowning man.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
बालस्य नेह शरणं पितरौ नृसिंह नार्तस्य चागदमुदन्वति मज्जतो नौः । तप्तस्य तत्प्रतिविधिर्य इहाञ्जसेष्ट- स्तावद्विभो तनुभृतां त्वदुपेक्षितानाम्
bālasya neha śaraṇaṃ pitarau nṛsiṃha nārtasya cāgadamudanvati majjato nauḥ | taptasya tatpratividhirya ihāñjaseṣṭa- stāvadvibho tanubhṛtāṃ tvadupekṣitānām
SB 7.9.19