The references to the topography of Jerusalem in vv. 1, 2, do not absolutely require, though they recommend, the supposition, already mentioned, that this psalm completes a triad which covers the experience of the restored Israel from the time just prior to its deliverance up till the period of its return to Jerusalem. The strength of the city perched on its rocky peninsula, and surrounded by guardian heights, would be the more impressive to eyes accustomed to the plains of Babylon, where the only defence of cities was artificial. If this hypothesis as to the date of the psalm is accepted, its allusions to a foreign domination and to half-hearted members of the community, as distinguished from manifest workers of evil, fall in with the facts of the period. The little band of faithful men was surrounded by foes, and there were faint hearts among themselves, ready to temporise and "run with the hare," as well as "hunt with the hounds." In view of deliverance accomplished and of perils still to be faced, the psalmist sings this strong brief song of commendation of the excellence of Trust, anticipates as already fulfilled the complete emancipation of the land from alien rule, and proclaims, partly in prayer and partly in prediction, the great law of retribution--certain blessedness for those who are good, and destruction for the faithless. The first of the two grand images in vv. 1, 2, sets forth the stability of those who trust in Jehovah. The psalmist pictures Mount Zion somewhat singularly as "sitting steadfast," whereas the usual expression would be "stands firm." But the former conveys still more forcibly the image and impression of calm, effortless immobility. Like some great animal couched at ease, the mountain lies there, in restful strength. Nothing can shake it, except One Presence, before which the hills "skip like young rams." Thus quietly steadfast and lapped in repose, not to be disturbed by any external force, should they be who trust in Jehovah, and shall be in the measure of their trust.