Be pleased, O Lord, to deliver us. Though one deliverance is just effected (Psalms 40:2), it is not enough; something more is required. The psalmist's life is still threatened by enemies (Psalms 40:14); he is still scoffed at and flouted (Psalms 40:15).
O Lord, make haste to help me; literally, Lord, make haste to my help (comp. Psalms 22:19; Psalms 31:2; Psalms 38:22). The Church follows the example set, when she says in her versicles, "O God, make speed to save us.
O Lord, make haste to help us."