Too frequent rewards signify that the enemy is at the end of his
resources;
Because, when an army is hard pressed, as Tu Mu says, there is
always a fear of mutiny, and lavish rewards are given to keep the
men in good temper.
too many punishments betray a condition of dire distress.
Because in such case discipline becomes relaxed, and unwonted
severity is necessary to keep the men to their duty.