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Śrīmad-Bhāgavatam
[Canto 8, Ch. 5]
saḥ —He (the Supreme Personality of Godhead);  naḥ —unto us;  dhāsyati —will give;  śam —the good fortune we need;  sura-priyaḥ —because He is naturally very dear to the devotees.
TRANSLATION
Now is the time to invoke the mode of goodness of the living entities who have accepted material bodies. The mode of goodness is meant to establish the Supreme Lord's rule, which will maintain the existence of the creation. Therefore, this is the opportune moment to take shelter of the Supreme Personality of Godhead. Because He is naturally very kind and dear to the demigods, He will certainly bestow good fortune upon us.
PURPORT
The material world is conducted by the three modes of nature, namely  sattva-guṇa ,  rajo-guṇa  and  tamo-guṇa . By  rajo-guṇa  everything material is created, by  sattva-guṇa  everything material is maintained properly, and by  tamo-guṇa , when the creation is improperly situated, everything is destroyed.
From this verse we can understand the situation of Kali-yuga, through which we are now passing. Just before the beginning of Kali-yuga—or, in other words, at the end of Dvāpara-yuga—Lord Śrī Kṛṣṇa appeared and left His instructions in the form of  Bhagavad-gītā , in which He asked all living entities to surrender unto Him. Since the beginning of Kali-yuga, however, people have practically been unable to surrender to the lotus feet of Kṛṣṇa, and therefore, after some five thousand years, Kṛṣṇa came again as Śrī Caitanya Mahāprabhu just to teach the entire world how to surrender unto Him, unto Śrī Kṛṣṇa, and thus be purified.
Surrendering unto the lotus feet of Kṛṣṇa means achieving complete purification. Kṛṣṇa says in  Bhagavad-gītā  (18.66):
sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja ahaṁ tvāṁ sarva-pāpebhyo mokṣayiṣyāmi mā śucaḥ