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The Nectar of Devotion
Krṣṇa is the Supreme Personality of Godhead and can see all that is past, present and future, to teach the people in general He used to always refer to the scriptures. For example, in the  Bhagavad-gītā , although Krṣṇa was speaking as the supreme authority, He still mentioned and quoted  Vedānta-sūtra  as authority. There is a statement in the  Śrīmad-Bhāgavatam  wherein a person jokingly says that Krṣṇa, the enemy of Kaṁsa, is known as the seer through the  śāstras . In order to establish His authority, however, He is now engaged in seeing the  gopīs , whereby the  gopīs  are becoming maddened.
21. Puree
There are two kinds of supreme purity. When one type is possessed, one is able to deliver a sinful person. When the other type is possessed, one does not do anything which is impure. A person who possesses either of these qualities is called supremely pure. Kṛṣṇa is both; He can deliver all sinful conditioned souls, and at the same time, He never does anything by which He can be contaminated.
In this connection, Vidura, while trying to detach his elder brother, Dhṛtarāṣṭra, from his familial attachments, said, “My dear brother, you just fix your mind on the lotus feet of Kṛṣṇa, who is worshiped with beautiful erudite verses by great sages and saintly persons. Kṛṣṇa is the supreme deliverer amongst all other deliverers. Undoubtedly there are great demigods like Lord Śiva and Lord Brahmā, but their positions as deliverers depend always upon the mercy of Kṛṣṇa.” Therefore Vidura advised his elder brother Dhṛtarāṣṭra to concentrate his mind and worship only Kṛṣṇa. If one simply chants the holy name of Kṛṣṇa, this holy name will rise within one’s heart like the powerful sun and will immediately dissipate all the darkness of ignorance. Vidura advised Dhṛtarāṣṭra to therefore think always of Kṛṣṇa so that the volumes of contaminations due to sinful activities would be washed off immediately. In the  Bhagavad-gītā  also Kṛṣṇa is addressed by Arjuna as  paraṁ brahma paraṁ dhāma pavitram —the supreme pure. There are many other instances exhibiting Kṛṣṇa’s supreme purity.