Generally the distressed, the needy, the intelligent and the inquisitive, who have performed some pious activities, worship or begin to worship the Lord. Others, who are thriving on misdeeds only, regardless of status, cannot approach the Supreme due to being misled by the illusory energy. Therefore, for a pious person, if there is some calamity there is no other alternative than to take shelter of the lotus feet of the Lord. Constantly remembering the lotus feet of the Lord means preparing for liberation from birth and death. Therefore, even though there are so-called calamities, they are welcome because they give us an opportunity to remember the Lord, which means liberation.
(Srimad Bhagavatam-----1:8:25-----purport).

This material world is certified by the Lord in the Bhagavad-gītā as a dangerous place full of calamities. Less intelligent persons prepare plans to adjust to thosecalamities without knowing that the nature of this place is itself full of calamities. They have no information of the abode of the Lord, which is full of bliss and without trace of calamity. The duty of the sane person, therefore, is to be undisturbed by worldly calamities, which are sure to happen in all circumstances. Suffering all sorts of unavoidable misfortunes, one should make progress in spiritual realization because that is the mission of human life.
(Srimad Bhagavatam-----1:8:25-----purport).

Material advancement of civilization means advancement of the reactions of the threefold miseries due to celestial influence, earthly reactions and bodily or mental pains. By the celestial influence of the stars there are many calamities like excessive heat, cold, rains or no rains, and the aftereffects are famine, disease and epidemic. The aggregate result is agony of the body and the mind. Man-made material science cannot do anything to counteract these threefold miseries. They are all punishments from the superior energy of māyā under the direction of the Supreme Lord. Therefore our constant touch with the Lord by devotional service can give us relief without our being disturbed in the discharge of our human duties.
(Srimad Bhagavatam-----1:14:10-----purport).

When a man's eyes, arms and thighs all quiver constantly, one must know that something is going to happen which is undesirable. These undesirables are compared to fire in a forest. No one goes into the forest to set fires, but fires automatically take place in the forest, creating inconceivable calamities for the living beings of the forest. Such a fire cannot be extinguished by any human efforts. The fire can be extinguished only by the mercy of the Lord, who sends clouds to pour water on the forest. Similarly, undesirable happenings in life cannot be checked by any number of plans. Such miseries can be removed only by the mercy of the Lord, who sends His bona fide representatives to enlighten human beings and thus save them from all calamities.
(Srimad Bhagavatam-----1:14:11-----purport).

The purport of this verse is that when a devotee is in a calamitous condition he takes it as a benediction of the Supreme Lord and takes responsibility himself for his past misdeeds. In such a condition, he offers still more devotional service and is not disturbed. One who lives in such a disposition of mind, engaged in devotional service, is the most eligible candidate for promotion to the spiritual world. In other words, such a devotee's claim for promotion to the spiritual world is assured in all circumstances.
(Srimad Bhagavatam-----4:6:45-----purport).

The ultimate purpose of offering oblations in sacrifice is to please Lord Viṣṇu. But in this Age of Kali it is very difficult to collect the different articles required for offering sacrifices. People have neither the means to collect the required paraphernalia nor the necessary knowledge or tendency to offer such sacrifices. Therefore, in this Age of Kali, when people are mostly unfortunate, full of anxieties and disturbed by various kinds of calamities, the only sacrifice recommended is the performance of saṅkīrtana-yajña. Worshiping Lord Caitanya by the saṅkīrtana-yajña is the only recommended process in this age.
(Krsna Book).

It is said that wherever the chanting of the holy name of Kṛṣṇa is done, even negligently, all bad elements—witches, ghosts and dangerous calamities—immediately disappear. And this is certainly true of the place where the chanting of the holy name of Kṛṣṇa is done seriously—especially in Vṛndāvana when the Supreme Lord was personally present.
(Krsna Book).