Cast no dirt into the well that gives you water.
More Korean Proverbs:
Even children of the same mother look different.Korean
Words have no wings but they can fly many thousands of miles.
Korean
A nobleman's calf does not know how a butcher kills.
Korean
In the valley where there are no tigers the hare is king.
Korean
Three years will eradicate even murderous thoughts.
Korean
Wise men philosophize as the fools live on.
Korean