why humility?

A rider came across some soldiers trying to move a heavy log without success.
The corporal was standing by as the  men struggled.
 The rider asked the corporal why he wasnt helping. The corporal replied,"I am the corporal ,i give orders". The rider dismounted,went up & stood by the soldiers & helped them move the log.
The rider quietly mounted his horse & went 2the corporal & said,"next time ur men need help, send for the commander in chief.

After leaving, the soldiers & corporal found out that the rider was George Washington. >>simplicity & humility are two hallmarks of greatness.