One who is not Kṛṣṇa conscious is subjected to material desires while contemplating the objects of the senses. The senses require real engagements, and if they are not engaged in the transcendental loving service of the Lord, they will certainly seek engagement in the service of materialism.
(Bhagacad-Gita---2:62--purport).

Material desires, when unsatiated, generate anger, and thus the mind, eyes and chest become agitated. Therefore, one must practice to control them before one gives up this material body. One who can do this is understood to be self-realized and is thus happy in the state of self-realization. It is the duty of the transcendentalist to try strenuously to control desire and anger.
(Bhagacad-Gita---5:23---purport).

Material desires in the mind are the trash of material contamination. By such contamination, the living being is faced with so many compatible and incompatible things that discourage the very existence of spiritual identity. Birth after birth the conditioned soul is entrapped with so many pleasing and displeasing elements, which are all false and temporary. They accumulate due to our reactions to material desires, but when we get in touch with the transcendental Lord in His variegated energies by devotional service, the naked forms of all material desires become manifest, and the intelligence of the living being is pacified in its true color. As soon as Arjuna turned his attention towards the instructions of the Lord, as they are inculcated in the Bhagavad-gītā, his true color of eternal association with the Lord became manifest, and thus he felt freed from all material contaminations.
(Srimad Bhagavatam---1:15:29---purport).

The qualification of bhakti, or devotional service to the Lord, is that the devotee should be free from all material contaminations and desires. This freedom is called vairāgya, or renouncement of material desires. One who engages in devotional service to the Lord according to regulative principles is automatically freed from material desires, and in that pure state of mind one can realize the Personality of Godhead.
(Srimad Bhagavatam---3:13:39).

Being covered by material desires, a spirit soul is also considered to be covered by designations belonging to a particular type of body. Thus he considers himself an animal, man, demigod, bird, beast, etc. In so many ways he is influenced by false identification caused by false egotism, and being covered by illusory material desires, he distinguishes between matter and spirit. When one is devoid of such distinctions, there is no longer a difference between matter and spirit. At that time, the spirit is the only predominating factor. As long as one is covered by material desires, he thinks himself the master or the enjoyer. Thus he acts for sense gratification and becomes subjected to material pangs, happiness and distress.
(Srimad Bhagavatam---4:22:28).

Those who are freed from all material contaminations surrender unto the Supreme Lord and engage in His devotional service. As long as the material contamination is not completely washed off, they are by nature nondevotees. But even those who have material desires and who resort to the Supreme Lord are not so much attracted by external nature; because of approaching the right goal, they soon become free from all material lust. In the Śrīmad-Bhāgavatam it is recommended that whether one is a pure devotee and is free from allmaterial desires, or is full of material desires, or desires liberation from material contamination, he should in all cases surrender to Vāsudeva and worship Him.
(Bhagacad-Gita----7:20---purport).