7:10-11 David counted on God to defend him as a shield since God saves the upright in heart, and David was upright. His confidence lay also in God's righteous character. God would judge justly, and injustice touches His heart as well as His head. Even though God does not always judge as quickly as His people want, injustice does not escape His eye, and He will judge one day righteously (cf. 2 Pet. 3:9). In view of this we can leave vengeance up to Him (Rom. 12:19; Heb. 10:30).
7:12-13 David painted God as a warrior going to battle against the wicked who refuse to repent. God always gives people opportunity to judge their own sinful behavior and turn from it, but if they refuse to judge themselves, He will judge them (cf. 1 Cor. 11:31).
7:14-16 The evil the wicked conceive in their minds and give birth to in their actions will not turn out the way they hoped. Rather than snaring the righteous in their traps they will be caught in them themselves. What they sow they will reap (cf. Exod. 21:24-25; Matt. 26:52; Gal. 6:7).
