The most important function of a devotee is to have complete attachment for Lord Śrī Kṛṣṇa, the father of all living beings.
(Srimad Bhagavatam----1:19:16----purport).

Attachment cannot be killed; it has simply to be transferred. Attachment for material things is called material consciousness, and attachment for Kṛṣṇa or His devotee is called Kṛṣṇa consciousness. Consciousness, therefore, is the platform of attachment. It is clearly stated here that when we simply purify the consciousness from material consciousness to Kṛṣṇa consciousness, we attain liberation. Despite the statement that one should give up attachment, desirelessness is not possible for a living entity. A living entity, by constitution, has the propensity to be attached to something. We see that if someone has no object of attachment, if he has no children, then he transfers his attachment to cats and dogs. This indicates that the propensity for attachment cannot be stopped; it must be utilized for the best purpose. Our attachment for material things perpetuates our conditional state, but the same attachment, when transferred to the Supreme Personality of Godhead or His devotee, is the source of liberation.
(Srimad Bhagavatam----3:25:20----purport).

As long as either is attached to the other for such material enjoyment, the woman is dangerous for the man, and the man is also dangerous for the woman. But if the attachment is transferred to Kṛṣṇa, both of them become Kṛṣṇa conscious, and then marriage is very nice.
(Srimad Bhagavatam----3:31:42----purport).

The disciple follows strictly and in this way learns how to control his senses. Then, by using his pure intelligence, he gradually becomes a lover of the Supreme Personality of Godhead. In this way one's life becomes perfect, and his attachment for Kṛṣṇa becomes positively manifested.
(Srimad Bhagavatam----7:7:33----purport).

From the very beginning of one's life one should practice bhakti-yoga, which increases one's attachment for Kṛṣṇa.
(Srimad Bhagavatam----9:9:42----purport).

A neophyte disciple begins by hearing and chanting, associating with devotees and practicing the regulative principles, and thus he vanquishes all of his unwanted bad habits. In this way he develops attachment for Kṛṣṇa and cannot forget Kṛṣṇa even for a moment.
(Sri Caitanya Caritamrta----1:7:83----purport).

In bhakti, a devotee's only attachment is Kṛṣṇa; he no longer wants to maintain his attachments to many other things.
(Sri Caitanya Caritamrta----1:7:143----purport).

When one's attachment to Kṛṣṇa becomes very deep, one attains the condition called love of Godhead.
(Teachings of Lord Caitanya).

Attraction for remembering Kṛṣṇa's activities is known as attachment for Kṛṣṇa.
(Nectar of Devotion).

If an ordinary man develops such attachment for Kṛṣṇa and fortunately performs devotional activities in the association of pure devotees, he can also rise to the platform of pure devotional service.
(Nectar of Devotion).

By the association of pure devotees attachment for Kṛṣṇa can be aroused.
(Nectar of Devotion).

In distress a devotee's feelings of attachment to Kṛṣṇa are magnified.
(Krsna Book).

The entire process of austerity and penance is meant to detach one from the material world and enhance one's attachment to Kṛṣṇa, the Supreme Personality of Godhead.
(Krsna Book).

The more we study the pastimes of the Lord, the more we become attached to Him. This very attachment to Kṛṣṇa makes one eligible to be transferred to His abode, Goloka Vṛndāvana.
(Krsna Book).