Arise, O LORD, into your rest; you, and the ark of your strength.
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Augustine of Hippo
8. "Arise, O Lord, into Thy resting place" (ver. 8). He saith unto the Lord sleeping, "Arise." Ye know already who slept, and who rose again. ..."Thou, and the ark of Thy sanctification:" that is, Arise, that the ark of Thy sanctification, which Thou hast sanctified, may arise also. He is our Head; His ark is His Church: He arose first, the Church will arise also. The body would not dare to promise itself resurrection, save the Head arose first. The Body of Christ, that was born of Mary, hath been understood by some to be the ark of sanctification; so that the words mean, Arise with Thy Body, that they who believe not may handle. ...
Sanctified. Hebrew, "ark of thy strength "which title proceeds from the sanctity of God, who resides there, 1 Kings vi. 20. Our heart ought to be his resting place, Isaias lxvi. 2. (Berthier)
Leaving Silo, come into thy temple, with the ark where thou sanctifiest thy people. He contemplates a higher mystery, the coming of the Messias, and his glorious resurrection. (Worthington)
The same words were repeated, when the ark was removed in the desert, and by Solomon, as they might be also by the captives. (Calmet) ...