In the darkness of night a snake can find its eatables simply by hearing the frog's very pleasant cry. The snake can understand, "There is the frog," and he captures the frog simply because of its sound vibration. This example is sometimes given for persons who vibrate sounds simply for death. One may have a very nice tongue that can vibrate sound like the frogs, but that kind of vibration is simply calling death. The best use of the tongue and of sound vibration is to chant Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. That will protect one from the hands of cruel death.
(Srimad Bhagavatam--3:29:29--purport).

The brāhmaṇas, the cows and the defenseless creatures are My own body. Those whose faculty of judgment has been impaired by their own sin look upon these as distinct from Me. They are just like furious serpents, and they are angrily torn apart by the bills of the vulturelike messengers of Yamarāja, the superintendent of sinful persons.
The defenseless creatures, according to Brahma-saṁhitā, are the cows, brāhmaṇas, women, children and old men. Of these five, the brāhmaṇas and cows are especially mentioned in this verse because the Lord is always anxious about the benefit of the brāhmaṇas and the cows and is prayed to in this way. The Lord especially instructs, therefore, that no one should be envious of these five, especially the cows and brāhmaṇas. In some of the Bhāgavatam readings, the word duhitṟḥ is used instead of duhatīḥ. But in either case, the meaning is the same. Duhatīḥ means "cow," and duhitṟḥ can also be used to mean "cow" because the cow is supposed to be the daughter of the sun-god. Just as children are taken care of by the parents, women as a class should be taken care of by the father, husband or grown-up son. Those who are helpless must be taken care of by their respective guardians, otherwise the guardians will be subjected to the punishment of Yamarāja, who is appointed by the Lord to supervise the activities of sinful living creatures. The assistants, or messengers, of Yamarāja are likened here to vultures, and those who do not execute their respective duties in protecting their wards are compared to serpents. Vultures deal very seriously with serpents, and similarly the messengers will deal very seriously with neglectful guardians.
Srimad Bhagavatam--3:16:10--translation and purport).

When one's desire to love Kṛṣṇa in one's particular relationship becomes intensified, this is known as pure love of Godhead. In the beginning a devotee is engaged in the regulative principles of devotional service by the order of his spiritual master. When one thereby becomes completely purified of all material contamination, there develops an attachment and taste for devotional service. This taste and attachment, when gradually intensified in the course of time, becomes love. The word love can be actually applied only in relationship with the Personality of Godhead. In the material world, love is not applicable at all. What goes on under the name of love in the material world is nothing but lust. There is a gulf of difference between love and lust, like the difference between gold and iron. In the Nārada-pañcarātra it is clearly stated that when lust is completely transferred to the Supreme Godhead and the concept of kinship is completely reposed in Him, such is accepted as pure love of God by great authorities like Bhīṣma, Prahlāda, Uddhava and Nārada.
Great authorities like Bhīṣma have explained that love of Godhead means completely giving up all so-called love for any other person. According to Bhīṣma, love means reposing one's affection completely upon one person, withdrawing all affinities for any other person. This pure love can be transferred to the Supreme Personality of Godhead under two conditions—out of ecstasy and out of the causeless mercy of the Supreme Personality of Godhead Himself.
(Nectar of Devotion).