Srimad Bhagavatam Canto 05, Chapter 14, Text 13

SB 5.14.13

ekadasat-prasangan nikrta-matir vyudaka-srotah-skhalanavad ubhayato ’pi duhkhadam pakhandam abhiyati.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Sometimes, to mitigate distresses in this forest of the material world, the conditioned soul receives cheap blessings from atheists. He then loses all intelligence in their association. This is exactly like jumping in a shallow river. As a result one simply breaks his head. He is not able to mitigate his sufferings from the heat, and in both ways he suffers. The misguided conditioned soul also approaches so-called sadhus and svamis who preach against the principles of the Vedas. He does not receive benefit from them, either in the present or in the future.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Cheaters are always there to manufacture their own way of spiritual realization. To get some material benefit, the conditioned soul approaches these pseudo sannyasis and yogis for cheap blessings, but he does not receive any benefit from them, either spiritual or material. In this age there are many cheaters who show some jugglery and magic. They even create gold to amaze their followers, and their followers accept them as God. This type of cheating is very prominent in Kali-yuga. Visvanatha Cakravarti Thakura describes the real guru in this way.
 tranaya karunya-ghanaghanatvam
praptasya kalyana-gunarnavasya
 vande guroh sri-caranaravindam
One should approach a guru who can extinguish the blazing fire of this material world, the struggle for existence. People want to be cheated, and therefore they go to yogis and svamis who play tricks, but tricks do not mitigate the miseries of material life. If being able to manufacture gold is a criterion for becoming God, then why not accept Krsna, the proprietor of the entire universe, wherein there are countless tons of gold? As mentioned before, the color of gold is compared to the will-o’-the-wisp or yellow stool; therefore one should not be allured by gold-manufacturing gurus but should sincerely approach a devotee like Jada Bharata. Jada Bharata instructed Rahugana Maharaja so well that the King was relieved from the bodily conception. One cannot become happy by accepting a false guru. A guru should be accepted as advised in Srimad-Bhagavatam (11.3.21). Tasmad gurum prapadyeta jijñasuh sreya uttamam: One should approach a bona fide guru to inquire about the highest benefit of life. Such a guru is described as follows: sabde pare ca nisnatam. Such a guru does not manufacture gold or juggle words. He is well versed in the conclusions of Vedic knowledge (vedais ca sarvair aham eva vedyah). He is freed from all material contamination and is fully engaged in Krsna’s service. If one is able to obtain the dust of the lotus feet of such a guru, his life becomes successful. Otherwise he is baffled both in this life and in the next.