Here is a helpful reminder of what discernment is?
While the quote speaks of books, it can apply to so many areas – TV, Movies, Magazines, Music, and even some Preachers.
If I have a joint of meat on my table of which the smell and the taste at once convince me that it is putrid and unwholesome, should I show discretion by eating the whole of it before giving my judgment that it is not fit for food? One mouthful is quite enough, and one sentence of some books ought to suffice for a sensible man to reject the whole mass. Let those who can relish such meat feed on it, but I have a taste for better food.