Blessed Are the Pure in Heart

The heart is what you are, in the secrecy of your thought and feeling, when nobody knows but God. And what you are at the invisible root matters as much to God as what your are at the visible branch. “Man looks on the outward appearance, but the Lord looks on the heart” (1 Samuel 16:7). From the heart are all the issues of life.

What comes out of the mouth proceeds from the heart . . . For out of the heart come evil thoughts, murder, adultery, fornication, theft, false witness, slander. These are what defile a man” (Matthew 15:18–19).

“Either make the tree good, and its fruit good; or make the tree bad, and its fruit bad; for the tree is known by its fruit . . . For out of the abundance of the heart the mouth speaks” (Matthew 12:33–34).

So the heart is utterly crucial to Jesus. What we are in the deep, private recesses of our lives is what he cares about most. Jesus did not come into the world simply because we have some bad habits that need to be broken. He came into the world because we have such dirty hearts that need to be purified. – John Piper, Blessed Are the Pure in Heart