When we read mundane literature, our hearts do not become peaceful. Rather our minds will always be agitated and we will want to talk about the subjects we have read. Such discussions often lead to argument, but the arguments have no conclusion, because there is no siddhanta. When we actually come to siddhanta, our minds can find shelter in Krishna. Otherwise, our minds will always be disturbed. Godless talks simply agitate the mind.
Lectures from a disciple Vol 1, Pg 416, last Paragraph