Listen to the way in which Jesus emphasized a truth about what defiles us,
“When He had called the multitude to Himself, He said to them, ‘Hear and understand: Not what goes into the mouth defiles a man; but what comes out of the mouth, this defiles a man’” (Matthew 15:10-11).
He wanted them to nail this down that defilement is a spiritual matter. The people then, as the people now, were locked into earthbound thinking, and the Lord wanted to break that way of thinking, causing people to focus on the spirit.
On what do you focus?