"Keep your heart with all vigilance,
for from it flow the springs of life.
24 Put away from you crooked speech,
and put devious talk far from you.
25 Let your eyes look directly forward,
and your gaze be straight before you.
26 Ponder the path of your feet;
then all your ways will be sure.
27 Do not swerve to the right or to the left;
turn your foot away from evil."
The direction of the heart leads to your mouth, eyes, hands, and feet doing these things instead of those. Heart is not disconnected from outside world. When you keep your heart, your life is well ordered. Unless you’re Job, you can't claim to have a pure heart while your life is a wreck. If you are disobeying on the outside, you can't appeal to a heart inside that means well. They are connected. Sin with the hands requires heart repentance.