Timothy Zahn said this quote

There is satisfaction in defeating an enemy. But one must never allow oneself to become complacent. There are always more enemies to be identified, faced, and vanquished.All warriors understand the need to face and defeat the enemy. Both aspects of the task can be challenging. Both can require thought, insight, and planning. Failures in any of those areas can cost unnecessary time and irreplaceable lives.But a warrior may forget that even the task of identifying the enemy can be difficult. And the cost of that failure can lead to catastrophe.