According to the author of 1 Samuel, this verse shows how brave David was, because he ran quickly to fight the giant, Goliath. This teaches us that with courage and faith, we can face big challenges.
1 Samuel 17:48: And it came to pass, when the Philistine arose, and came and drew nigh to meet David, that David hasted, and ran toward the army to meet the Philistine.
This verse advises to not resist evil and to turn the other cheek, which contradicts the aggressive approach described in 1 Samuel 17:48.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.