This sign over a short doorway is good advice. I’ve been trying to think of other similarly useful phrases which also have that playful element captured by the fact that the mind is part of the head, while simultaneously watching over it.
The best I’ve got so far is, heart your body. Which is, admittedly, not good.
Hear are some of my failed attempts:
Toe your foot
Elbow your arm
Lung your chest
Do nothing to your appendix
Acid your stomach
Watch your eyes
Arm your body (with weapons!)
Gall your stomach troubles
Wax your ears.
Drum your ear.
Cap yo’ knee.
Lash your eye.
Rib your chest cavity. (Am I reaching too much on this one?