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.(Bhakti Rasamrita Sindhu 1.1.11)
Impure or mixed devotional service is when devotional service is performed with personal motive for some result or mental speculation.
Example : King Pururava worshipped Sri Vishnu to get Urvashi. This is not pure devotional service. Prahlad boy performed pure devotional service and he did not want anything in return.
Replies
Hare Krsna
Will Krishna accept my devotion if I won't join any specific Sampradaya?
Yes, Krsna will accept pure devotional service even if someone doesn't belong to any specific Sampradaya.
Examples : Meerabai, Tukarama, Garuda.
Hare Krsna
what is pure and what is impure devotional service?
Hare Krsna
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.(Bhakti Rasamrita Sindhu 1.1.11)
Impure or mixed devotional service is when devotional service is performed with personal motive for some result or mental speculation.
Example : King Pururava worshipped Sri Vishnu to get Urvashi. This is not pure devotional service. Prahlad boy performed pure devotional service and he did not want anything in return.
Hare Krsna