The human heart!

(Thomas Watson)

"The human heart is the most deceitful
 of all things, and desperately wicked! Who
 really knows how bad it is?" Jeremiah 17:9

The human heart is full of hostility against God.

The human heart is the very nursery of sin.

The human heart is the storehouse where all
the weapons of unrighteousness lie.

The human heart is a lesser Hell.

"For from within, out of a person's heart—come
 evil thoughts, sexual immorality, theft, murder,
 adultery, greed, wickedness, deceit, lustful
 desires, envy, slander, pride, and foolishness.
 All these vile things come from within; they
 are what defile you." Mark 7:21-23

Click to see a picture of your heart!