anyābhilāṣitā-śūnyaṁ
jñāna-karmādy-anāvṛtam
ānukūlyena kṛṣṇānu-
śīlanaṁ bhaktir uttamā
One should render transcendental loving service to the Supreme Lord Kṛṣṇa favorably and without desire for material profit or gain through fruitive activities or philosophical speculation. That is called pure devotional service.
(Source: Bhagavad Gita As It Is, text 7.16 purport)
sarvopādhi-vinirmuktaṁ
tat-paratvena nirmalam
hṛṣīkeṇa hṛṣīkeśa-
sevanaṁ bhaktir ucyate
One should be free from all material designations and, by Kṛṣṇa consciousness, must be cleansed of all material contamination. He should be restored to his pure identity, in which he engages his senses in the service of the proprietor of the senses.
(Source: Nectar of Devotion, Introduction)
ataḥ śrī-kṛṣṇa-nāmādi
na bhaved grāhyam indriyaiḥ
sevonmukhe hi jihvādau
svayam eva sphuraty adaḥ
No one can understand the transcendental nature of the name, form, quality and pastimes of Śrī Kṛṣṇa through his materially contaminated senses. Only when one becomes spiritually saturated by transcendental service to the Lord are the transcendental name, form, quality and pastimes of the Lord revealed to him.
(Source: Bhagavad Gita As It Is, text 6.8 purport)
anasaktasya visayan
yatharham upayuñjatah
nirbandhah krsna-sambandhe
yuktam´ vairagyam ucyate
When one is not attached to anything but at the same time accepts everything in relation to Krsna, one is rightly situated above possessiveness.
(Source: Bhagavad Gita As It Is, text 6.10 purport)
anasaktasya — of one who is without attachment;
visayan — to material sense objects;
yatha-arham — according to suitability;
upayuñjatah — engaging;
nirbandhah — without bondage;
krsna-sambandhe — in relationship with Krsna;
yuktam — proper;
vairagyam — renunciation;
ucyate — is called;