If he is taking his ease, give him no rest.
This is probably the meaning, though Mei Yao-ch‘ên has the note:
以我之佚待彼之勞 “while we are taking our ease, wait for the enemy
to tire himself out.” The _Yü Lan_ has 引而勞之 “Lure him on and
tire him out.” This would seem also to have been Ts‘ao Kung’s
text, judging by his comment 以利勞之.
If his forces are united, separate them.
Less plausible is the interpretation favoured by most of the
commentators: “If sovereign and subject are in accord, put
division between them.”