Srimad Bhagavatam Canto 07, Chapter 13, Text 07

SB 7.13.7

nasac-chastresu sajjeta
 nopajiveta jivikam
vada-vadams tyajet tarkan
 paksam kamca na samsrayet
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Literature that is a useless waste of time — in other words, literature without spiritual benefit — should be rejected. One should not become a professional teacher as a means of earning one’s livelihood, nor should one indulge in arguments and counterarguments. Nor should one take shelter of any cause or faction.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
A person desiring to advance in spiritual understanding should be extremely careful to avoid reading ordinary literature. The world is full of ordinary literature that creates unnecessary agitation in the mind. Such literature, including newspapers, dramas, novels and magazines, is factually not meant for advancement in spiritual knowledge. Indeed, it has been described as a place of enjoyment for crows (tad vayasam tirtham). Anyone advancing in spiritual knowledge must reject such literature. Furthermore, one should not concern oneself with the conclusions of various logicians or philosophers. Of course, those who preach sometimes need to argue with the contentions of opponents, but as much as possible one should avoid an argumentative attitude. In this connection, Srila Madhvacarya says:
aprayojana-paksam na samsrayet
naprayojana-paksi syan
 na vrtha sisya-bandha-krt
na codasinah sastrani
 na viruddhani cabhyaset
na vyakhyayopajiveta
 na nisiddhan samacaret
evam-bhuto yatir yati
 tad-eka-sarano harim
“There is no need to take shelter of unnecessary literature or concern oneself with many so-called philosophers and thinkers who are useless for spiritual advancement. Nor should one accept a disciple for the sake of fashion or popularity. One should be callous to these so-called sastras, neither opposing nor favoring them, and one should not earn one’s livelihood by taking money for explaining sastra. A sannyasi must always be neutral and seek the means to advance in spiritual life, taking full shelter under the lotus feet of the Lord.”
Srimad Bhagavatam Canto 07, Chapter 13, Text 06
Srimad Bhagavatam Canto 07, Chapter 13, Text 08