The fourth strophe (vv. 13-15) begins the solo part. It clothes in a garb appropriate to a sacrificial system the thought expressed in more spiritual dress in the next strophe, that God's deliverance should evoke men's praise. The abundance and variety of sacrifices named, and the fact that "rams" were not used for the offerings of individuals, seem to suggest that the speaker is, in some sense, representing the nation, and it has been supposed that he may be the high priest. But this is merely conjecture, and the explanation may be that there is a certain ideal and poetical tone over the representation, which does not confine itself to scrupulous accuracy. The last strophe (vv. 16-20) passes beyond sacrificial symbols, and gives the purest utterance to the emotions and resolves which ought to well up in a devout soul on occasion of God's goodness. Not only does the psalmist teach us how each individual must take the general blessing for his very own--of which act the faith which takes the world's Christ for my Christ is the supreme example--but he teaches us that the obligation laid on all recipients of God's mercy is to tell it forth, and that the impulse is as certain to follow real reception as the command is imperative. Just as Israel received deliverances that the whole earth might learn how strong and gracious was Israel's God, we receive His blessings, and chiefly His highest gift of life in Christ, not only that we may live, but that, living, we may "declare the works of the Lord." He has little possession of God's grace who has not felt the necessity of speech, and the impossibility of the lips being locked when the heart is full. The psalmist tells his experience of God's answers to his prayer in a very striking fashion. Ver. 17 says that he cried to God; and while his uttered voice was supplication, the song extolling God for the deliverance asked was, as it were, lying under his tongue, ready to break forth,--so sure was he that his cry would be heard. That is a strong faith which prepares banners and music for the triumph before the battle is fought. It would be presumptuous folly, not faith, if it rested on anything less certain than God's power and will.