A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
psa 93:1This and the six following Psalms were applied by the Jews to the times of the Messiah. The theme is God's supremacy in creation and providence. (Psa 93:1-5)
God is described as a King entering on His reign, and, for robes of royalty, investing Himself with the glorious attributes of His nature. The result of His thus reigning is the durability of the world.
psa 93:2His underived power exceeds the most sublime exhibitions of the most powerful objects in nature (Psa 89:9).
psa 93:5While His power inspires dread, His revealed will should secure our confidence (compare Psa 19:7; Psa 25:10), and thus fear and love combined, producing all holy emotions, should distinguish the worship we offer in His house, both earthly and heavenly.