With ver. 6 the theme of the psalm is given forth, in language which recalls Solomon's and Daniel's similar confessions (1 Kings viii. 47; Dan. ix. 5). The accumulation of synonyms for sin witnesses at once to the gravity and manifoldness of the offences, and to the earnestness and comprehensiveness of the acknowledgment. The remarkable expression "We have sinned _with_ our fathers" is not to be weakened to mean merely that the present generation had sinned like their ancestors, but gives expression to the profound sense of national solidarity, which speaks in many other places of Scripture, and rests on very deep facts in the life of nations and their individual members. The enumeration of ancestral sin begins with the murmurings of the faint-hearted fugitives by the Red Sea. In Psalm cv. the wonders in Egypt were dilated on and the events at the Red Sea unmentioned. Here the signs in Egypt are barely referred to and treated as past at the point where the psalm begins, while the incidents by the Red Sea fill a large space in the song. Clearly, the two psalms supplement each other. The reason given for Israel's rebellion in Psalm cvi. is its forgetfulness of God's mighty deeds (ver. 7_a_, _b_), while in Psalm cv. the remembrance of these is urgently enjoined. Thus, again, the connection of thought in the pair of psalms is evident. Every man has experiences enough of God's goodness stored away in the chambers of his memory to cure him of distrust, if he would only look at them. But they lie unnoticed, and so fear has sway over him. No small part of the discipline needed for vigorous hope lies in vigorous exercise of remembrance. The drying up of the Red Sea is here poetically represented, with omission of Moses' outstretched rod and the strong east wind, as the immediate consequence of God's omnipotent rebuke. Ver. 9_b_ is from Isa. lxiii. 13, and picturesquely describes the march through that terrible gorge of heaped-up waters as being easy and safe, as if it had been across some wide-stretching plain, with springy turf to tread on. The triumphant description of the completeness of the enemies' destruction in ver. 11_b_ is from Exod. xiv. 28, and "they believed on His words" is in part quoted from Exod. xiv. 31, while Miriam's song is referred to in ver. 12_b_.
The next instance of departure is the lusting for food (vv. 13-15). Again the evil is traced to forgetfulness of God's doings, to which in ver. 13_b_ is added impatient disinclination to wait the unfolding of His counsel or plan. These evils cropped up with strange celerity. The memory of benefits was transient, as if they had been written on the blown sands of the desert. "They hasted, they forgot His works." Of how many of us that has to be said! We remember pain and sorrow longer than joy and pleasure. It is always difficult to bridle desires and be still until God discloses His purposes. We are all apt to try to force His hand open, and to impose our wishes on Him, rather than to let His will mould us. So, on forgetfulness and impatience there followed then, as there follow still, eager longings after material good and a tempting of God. "They lusted a lust" is from Num. xi. 4. "Tempted God" is found in reference to the same incident in the other psalm of historical retrospect (lxxviii. 18). He is "tempted" when unbelief demands proofs of His power, instead of waiting patiently for Him. In Num. xi. 33 Jehovah is said to have smitten the people "with a very great plague." The psalm specifies more particularly the nature of the stroke by calling it "wasting sickness," which invaded the life of the sinners. The words are true in a deeper sense, though not so meant. For whoever sets his hot desires in self-willed fashion on material good, and succeeds in securing their gratification, gains with the satiety of his lower sense the loss of a shrivelled spiritual nature. Full-fed flesh makes starved souls.