Psalms 40:13-15

David cried out for quick deliverance (cf. Psalms 35:4). As the Lord’s anointed who was serving Him sacrificially with a pure heart, the psalmist could make such a request boldly.

"It must be remembered that the enemies were probably not known personally. They were Israel’s national enemies who hated Israel, David, and Yahweh, the God of Israel. The psalmist no doubt knew the admonition to love one’s enemies (cf. Proverbs 25:21; Matthew 5:44), but these enemies destabilized the rule of God on earth! As long as the kingdom of God suffers persecution and harassment, we pray for God’s kingdom to come, which includes the petition that the Lord will come to vindicate his own and avenge his enemies (cf. 2 Thessalonians 1:5-10). The enemies liked taking potshots at God’s people, shouting contemptibly, ’Aha! Aha!’ (Psalms 40:15; Psalms 35:21; Psalms 35:25). The psalmist prays that the Lord will quickly and suddenly change their fortunes so that they will know who is God (Psalms 40:14; cf. Psalms 35:4; cf. Psalms 35:26 . . ." [Note: Ibid., p. 324.]