71:14-18 Regardless of the outcome in his case the writer determined to continue trusting and praising God. The Lord had demonstrated His righteousness, salvation, and mighty deeds for a long time and in many ways. Therefore the psalmist vowed to speak of them forever even if he could not tally up all God's faithful acts. If God forsook him he could not fully relate these testimonials to the present generation of his people.
71:19-21 The great things of which the writer testified included God's salvation out of many personal troubles. The psalmist had been down before, but God had always lifted him up. He prayed that this would be his experience again. His greatness or honor came from trusting in God and having that trust rewarded with deliverance.
71:22-24 In anticipation of God's help the writer promised to praise Him with stringed instruments as well as vocally. The title "Holy One of Israel"(v. 22) is common in Isaiah but rare in the Psalms occurring only three times (cf. 78:41; 89:18). In conclusion the psalmist spoke of his accusers' humiliation as already present even though that is what he was requesting. This is probably another instance of expressing confidence that something would happen by describing it as having already taken place.
When people have trusted in God over a lifetime and have seen Him deliver them from many trials it becomes easier for them to trust Him in the present. Just as continual unbelief makes faith more difficult, continual trust makes unbelief more difficult.
