Gird thy sword upon thy thigh - That is, Arm or prepare thyself for battle and conquest. The Messiah is introduced here as a conquering king; as about to go forward to subdue the nations to himself; as about to set up a permanent kingdom.
O most mighty - That is, Hero; Warrior; Conqueror.
With thy glory and thy majesty - With the glory and majesty appropriate to thee; or which properly belong to thee. This is at the same time the expression of a wish on the part of the author of the psalm, and a prophetic description. The psalmist desired that he would thus go forth to the conquest of the world; and saw that he would do it. Compare Psalms 45:5-6. It is needless to remark that this is easily and naturally applicable to the Messiah - the Lord Jesus - as going forth for the subjugation of the world to the authority of God. Compare 1 Corinthians 15:25, 1 Corinthians 15:28. See also, in reference to the figure used here, Isaiah 49:2; Hebrews 4:12; Revelation 1:16; Revelation 19:15.