Srimad Bhagavatam Canto 05, Chapter 05, Text 14

SB 5.5.14

karmasayam hrdaya-granthi-bandham
 avidyayasaditam apramattah
anena yogena yathopadesam
 samyag vyapohyoparameta yogat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
As I have advised you, My dear sons, you should act accordingly. Be very careful. By these means you will be freed from the ignorance of the desire for fruitive activity, and the knot of bondage in the heart will be completely severed. For further advancement, you should also give up the means. That is, you should not become attached to the process of liberation itself.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The process of liberation is brahma jijñasa, the search for the Absolute Truth. Generally brahma jijñasa is called neti neti, the process by which one analyzes existence to search out the Absolute Truth. This method continues as long as one is not situated in his spiritual life. Spiritual life is brahma-bhuta, the self-realized state. In the words of Bhagavad-gita (18.54):
brahma-bhutah prasannatma
 na socati na kanksati
samah sarvesu bhutesu
 mad-bhaktim labhate param
“One who is thus transcendentally situated at once realizes the Supreme Brahman and becomes fully joyful. He never laments or desires to have anything; he is equally disposed to every living entity. In that state, he attains pure devotional service unto Me.”
The idea is to enter into the para bhakti, the transcendental devotional service of the Supreme Lord. To attain this, one must analyze ones existence, but when one is actually engaged in devotional service he should not bother seeking out knowledge. By simply engaging in devotional service undeviatingly, one will always remain in the liberated condition.
mam ca yo ’vyabhicarena
 bhakti-yogena sevate
sa gunan samatityaitan
 brahma-bhuyaya kalpate
(Bg. 14.26)
The unflinching execution of devotional service is in itself brahma-bhuta. Another important feature in this connection is anena yogena yathopadesam. The instructions received from the spiritual master must be followed immediately. One should not deviate from or surpass the instructions of the spiritual master. One should not be simply intent on consulting books but should simultaneously execute the spiritual master’s order (yathopadesam). Mystic power should be achieved to enable one to give up the material conception, but when one actually engages in devotional service, one does not need to practice the mystic yoga system. The point is that one can give up the practice of yoga, but devotional service cannot be given up. As stated in Srimad-Bhagavatam (1.7.10):
atmaramas ca munayo
 nirgrantha apy urukrame
kurvanty ahaitukim bhaktim
 ittham-bhuta-guno harih
Even those who are liberated (atmarama) must always engage in devotional service. One may give up the practice of yoga when one is self-realized, but at no stage can one give up devotional service. All other activities for self-realization, including yoga and philosophical speculation, may be given up, but devotional service must be retained at all times.
Srimad Bhagavatam Canto 05, Chapter 05, Text 10-13
Srimad Bhagavatam Canto 05, Chapter 05, Text 15