Everyone must understand Kṛṣṇa's activities (janma karma ca me divyam (B.G.4:9). If one understands the purpose of Kṛṣṇa's coming to this earth and performing His activities, one is immediately liberated. This liberation is the purpose of the creation and Kṛṣṇa's descent upon the surface of the earth. Demons are very much interested in advancing a plan by which people will labor hard like cats, dogs and hogs, but Kṛṣṇa's devotees want to teach Kṛṣṇa consciousness so that people will be satisfied with plain living and Kṛṣṇa conscious advancement. Although demons have created many plans for industry and hard labor so that people will work day and night like animals, this is not the purpose of civilization. Such endeavors are jagato'hitaḥ; that is, they are meant for the misfortune of the people in general. Kṣayāya: such activities lead to annihilation. One who understands the purpose of Kṛṣṇa, the Supreme Personality of Godhead, should seriously understand the importance of the Kṛṣṇa consciousness movement and seriously take part in it. One should not endeavor for ugra-karma, or unnecessary work for sense gratification.
(Srimad Bhagavatam----9:24:59----purport).

"Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion—at that time I descend Myself." The real dharma is to surrender unto Kṛṣṇa, but the rebellious living entity, instead of surrendering to Kṛṣṇa, engages in adharma, in a struggle for existence to become like Kṛṣṇa. Therefore out of compassion Kṛṣṇa creates this material world to give the living entity a chance to understand his real position. Bhagavad-gītā and similar Vedic literatures are presented so that the living being may understand his relationship with Kṛṣṇa. Vedaiś ca sarvair aham eva vedyaḥ (B.G.15:15). All these Vedic literatures are meant to enable the human being to understand what he is, what his actual position is, and what his relationship is with the Supreme Personality of Godhead. This is called brahma-jijñāsā. Every conditioned soul is struggling, but human life provides the best chance for him to understand his position. Therefore this verse says, anugrahas tan-nivṛtteḥ, indicating that the false life of repeated birth and death must be stopped and the conditioned soul should be educated. This is the purpose of the creation.
(Srimad Bhagavatam----9:24:58----purport).

In this regard the queens might argue, "If our husband was protected by the Supreme Personality of Godhead when in the womb, why has he not been given protection now?" To this question the answer is, ya icchayeśaḥ sṛjatīdam avyayo ya eva rakṣaty avalumpate ca yaḥ. One cannot argue with the activities of the Supreme Personality of Godhead. The Lord is always free, and therefore He can protect and can also annihilate. He is not our order carrier; whatever He likes He will do. Therefore He is the Supreme Lord. The Lord does not create this material world at anyone's request, and therefore He can annihilate everything merely by His will. That is His supremacy. If one argues, "Why does He act in this way?" the answer is that He can do so because He is supreme. No one can question His activities. If one argues, "What is the purpose of this sinful creation and annihilation?" the answer is that to prove His omnipotence He can do anything, and no one can question Him. If He were answerable to us concerning why He does something and why He does not, His supremacy would be curtailed.
(Srimad Bhagavatam----7:2:39----purport).

Obviously, our life is dependent on supplies from the Lord. Even for our manufacturing enterprises, we require so many raw materials like metal, sulphur, mercury, manganese and so many essentials—all of which are supplied by the agents of the Lord, with the purpose that we should make proper use of them to keep ourselves fit and healthy for the purpose of self-realization, leading to the ultimate goal of life, namely, liberation from the material struggle for existence. This aim of life is attained by performance of yajñas. If we forget the purpose of human life and simply take supplies from the agents of the Lord for sense gratification and become more and more entangled in material existence, which is not the purpose of creation, certainly we become thieves, and therefore we are punished by the laws of material nature. A society of thieves can never be happy, for they have no aim in life. The gross materialist thieves have no ultimate goal of life. They are simply directed to sense gratification; nor do they have knowledge of how to perform yajñas. Lord Caitanya, however, inaugurated the easiest performance of yajña, namely the saṅkīrtana-yajña, which can be performed by anyone in the world who accepts the principles of Kṛṣṇa consciousness.
(Srimad Bhagavatam----7:2:10----purport).

This material world is created to give the conditioned souls a chance for rejuvenation for going back home, back to Godhead, and therefore generation of the living being is necessary for upkeep of the purpose of creation.
(Srimad Bhagavatam----2:10:26----purport).