I scanned the water intently, on alert for signs of trouble. During my six-hour shifts as a lifeguard, I watched from the side of the pool to ensure the safety of those swimming. Leaving my post, or even becoming lax in my attentiveness, could have grave consequences for those in the pool. If a swimmer was in danger of drowning due to injury or lack of skill, it was my responsibility to pluck them from the water and return them to safety on the pool deck.

After experiencing God’s aid in battle against the Philistines (2 Sam. 21:15–22), David likens his…