# he is robed in majesty; Yahweh has clothed and girded himself with strength

"he shows everyone that he is a powerful king" or "his majesty is there for all to see, like the robe a king wears; everything about Yahweh shows that he is strong and he is ready to do great work"

# girded himself

put on a belt—a band of leather or another material that a person wears around his waist—to prepare for work or battle

# The world is firmly established

"You have firmly established the world")

# it cannot be moved

"no one will ever move it"