Nothing on the outside can condemn or contaminate you…

Matthew 15:10-11, 17-18 

And He called the people to Him and said to them, “Hear and understand: it is not what goes into the mouth that defiles a person, but what comes out of the mouth; this defiles a person.” Do you not see that whatever goes into the mouth passes into the stomach and is expelled? But what comes out of the mouth proceeds from the heart, and this defiles a person. 
…only what is within you. 

Take a moment… Does any of this ring a bell

2 Timothy 3:2-4 

For people will be lovers of self and [utterly] self-centered, lovers of money and aroused by an inordinate [greedy] desire for wealth, proud and arrogant and contemptuous boasters. They will be abusive (blasphemous, scoffing), disobedient to parents, ungrateful, unholy and profane. [They will be] without natural [human] affection (callous and inhuman), relentless (admitting of no truce or appeasement); [they will be] slanderers (false accusers, troublemakers), intemperate and loose in morals and conduct, uncontrolled and fierce, haters of good. [They will be] treacherous [betrayers], rash, [and] inflated with self-conceit. [They will be] lovers of sensual pleasures and vain amusements more than and rather than lovers of God.