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The title of this Psalm is, "A song of praise, to the sons of Korah, on the second day of the week." Concerning this what the Lord deigneth to grant receive ye like sons of the firmament. For on the second day of the week, that is, the day after the first which we call the Lord's day, which also is called the second week-day, was made the firmament of Heaven. ¹ ...The second day of the week then we ought not to understand but of the Church of Christ: but the Church of Christ in the Saints, the Church of Christ in those who are written in Heaven, the Church of Christ in those who to this world's temptations yield not. For they are worthy of the name of "firmament." The Church of Christ, then, in those who are strong, of whom saith the Apostle, "We that are strong ought to bear the infirmities of the weak," ² is called the firmament. Of this it is sung in this Psalm. Let us hear, acknowledge, associate, glory, reign. For Her called firmament, hear also in the Apostolic Epistles, "the pillar and firmament ³ of the truth." ⁴ ...