Be careful to choose a right guru

So-called gurus instruct their disciples for the sake of material profit. Some guru advises that one meditate in such a way that his intelligence will increase in regard to keeping his body fit for sense gratification. Another guru advises that sex is the ultimate goal of life and that one should therefore engage in sex to the best of his ability. These are the instructions of foolish gurus. In other words, because of the instructions of a foolish guru one remains perpetually in material existence and suffers its tribulations. But if one is intelligent enough to take instructions from the Supreme Personality of Godhead, as enunciated in Bhagavad-gita or the Sankhya philosophy of Kapiladeva, one can very soon attain liberation and be situated in his original position of spiritual life.

Srimad Bhagavatam 8.24.51 purport