Shloka 67: भक्ता एकान्तिनो मुख्याः॥ ६७॥ 

bhaktā ekāntino mukhyāḥ.

भक्ता - devotees; एकान्तिनः - whose one and only goal is the Lord Himself; whose single pointed devotion towards the Lord is for its own sake; मुख्याः - primary 

Devotees whose sole, single goal is the Lord Himself and whose single pointed devotion towards the Lord is just for the sake of devotion, are the best devotees.

Narad Ji has already described Ananya Bhakti and Shri Krishna has also emphasized the importance of such single minded and unalloyed devotion. Here Narad Ji is reiterating the fact that devotees with such ananya bhakti and are devoted to God only for the sake of Love are the best type of devotees who are very dear to God.

Ananya bhakti is the primary requirement for achieving God’s divine grace and to reach this, we have to prepare ourselves and purify ourselves. This process has been described by Narad Ji so far in the Bhakti Sutra. And Shri Krishna has also taught us the whole process in the Bhagavad Gita.

A point to note is that, as explained by Shri Krishna, we can progress in the path of bhakti yoga by focusing on the form of Krishna. There are many artistic renditions of His form and it is advised to pick any one form and then focus our minds on that form. It is better than having a thousand forms and getting distracted by the various differences, etc.

There is a very profound statement made by Krishna in the Srimad Bhagavatam(11.14.21):भक्त्याहमेकया ग्राह्य: श्रद्धयात्मा प्रिय: सताम् ।

भक्ति: पुनाति मन्निष्ठा श्वपाकानपि सम्भवात् ॥ २१ ॥

bhaktyāham ekayā grāhyaḥ

śraddhayātmā priyaḥ satām

bhaktiḥ punāti man-niṣṭhā

śva-pākān api sambhavāt

bhaktyā — by devotional service; aham — I; ekayā — unalloyed; grāhyaḥ — am to be obtained; śraddhayā — by faith; ātmā — the source of our soul; priyaḥ — the object of love; satām — of the devotees; bhaktiḥ — pure devotional service; punāti — purifies; mat-niṣṭhā — fixing Me as the only goal; śva-pākān — dog-eaters; api — even; sambhavāt — from the contamination of low birth.

Only by practicing unalloyed devotional service with full faith in Me can one obtain Me. I am naturally dear to My devotees, who take Me as the only goal of their loving service. By engaging in such pure devotional service, even the dog-eaters can purify themselves from the contamination of their low birth.

Even unfortunate people who are born in families with tamasic gunas and who inherit the practice of sinful activities can at once be purified by the potency of pure devotional service. Such service must have Shri Krishna as the only goal (man-niṣṭhā), must be rendered with full faith (śraddhayā), and must be one pointed and without any selfish motivation (ekayā).