The "mountain-sea" spirit means that it is bad to repeat the same thing several times when fighting the enemy. There may be no help but to do something twice, but do not try it a third time.

Unless, say, you're going to overwhelm a critical position with superior numbers and superior technology at a tactically convenient time.

In some such cases being utterly predictable even has benefits. People who know they are going to lose and die if they fight are more inclined to surrender or flee. (This has obvious advantages if you are a pirate with a fearsome who doesn't want casualties.)

If you once make an attack and fail, there is little chance of success if you use the same approach again.

That actually sounds like solid advice in most situations. (Assuming 'fail' excludes 'weakened them significantly but did not quite defeat them'. Obviously a second attack then should be evaluated as a different approach.)