Adam Clarke on Psalms 116:7

Return unto thy rest, O my soul - God is the center to which all immortal spirits tend, and in connection with which alone they can find rest. Every thing separated from its center is in a state of violence; and, if intelligent, cannot be happy. All human souls, while separated from God by sin, are in a state of violence, agitation, and misery. From God all spirits come; to him all must return, in order to be finally happy. This is true in the general case; though, probably, the rest spoken of here means the promised land, into which they were now returning.

A proof of the late origin of this Psalm is exhibited in this verse, in the words למנוחיכי limenuchaichi, "to thy rest," and עליכי alaichi, "to thee," which are both Chaldaisms.