18 But the things that come out of the mouth come from the heart, and these things defile a person.
19 For out of the heart come evil ideas, murder, adultery, sexual immorality, theft, false testimony, slander. 20 These are the things that defile a person; it is not eating with unwashed hands that defiles a person.”
Taken from article: Charles Haddon Spurgeon: Preacher of Free Grace, or Religious Idiot?
An article explaining why you should not call people "religious idiots" has been posted here: http://www.discerningtheworld.com/2013/07/12/calling-others-idiots/