Srimad Bhagavatam Canto 11, Chapter 18, Text 38

SB 11.18.38

duhkhodarkesu kamesu
 jata-nirveda atmavan
 munim gurum upavrajet
One who is detached from sense gratification, knowing its result to be miserable, and who desires spiritual perfection, but who has not seriously analyzed the process for obtaining Me, should approach a bona fide and learned spiritual master.
In the previous verses Lord Krsna described the duty of one who has developed perfect knowledge. Now Lord Krsna discusses the situation of one who, desiring self-realization, has become detached from material life but lacks perfect knowledge of Krsna consciousness. Such a detached person desiring self-realization must approach the lotus feet of a bona fide spiritual master in Krsna consciousness, and then he will quickly come to the standard of perfect understanding. One who is seriously inclined toward spiritual perfection should not hesitate to adopt the regular discipline necessary for achieving the highest perfection in life.
Srimad Bhagavatam Canto 11, Chapter 18, Text 37
Srimad Bhagavatam Canto 11, Chapter 18, Text 39