The man who hunts a deer does ...

The man who hunts a deer does not gaze at the mountains.
 Takeda Nobushige

Quotes from the same author

One's soldier should not abuse the enemy. 'Arouse a bee and it will come at you with the force of a dragon.
 Takeda Nobushige
Good medicine is bitter to the mouth, but has an effect on the disease. Faithful words hurt one's ears, but have value for one's conduct.
 Takeda Nobushige