1 Yahweh reigneth; let the earth rejoice; let the multitude of isles be glad thereof.

2 Clouds and darkness are round about him: righteousness and judgment are the habitation of his [Yahoshua] throne.

3 A fire goeth before him, and burneth up his enemies round about.

4 His lightnings enlightened the world: the earth saw, and trembled.

5 The hills melted like wax at the presence of Yahweh, at the presence of the Adon of the whole earth.

6 The heavens declare his righteousness, and all the people see his glory.

7 Confounded be all they that serve graven images, that boast themselves of idols: worship him, all ye Elohim.

Elohim is a name bestowed on angels and orders of men.

'Worship him, all ye Elohim'... is quoted by Paul in the first chapter of Hebrews as a command of the Everlasting Father to the angels, that they should do homage to the Lord Jesus as His Son, when He shall introduce Him, into the world again at the opening of the future age. It is also written concerning Him, 

"Thou hast made Him a little lower than the Elohim."

Paul applies this to Jesus, saying, "we see Jesus, who was made a little lower than the angels." He continued inferior to them a little upwards of thirty years, from his birth of the flesh to His resurrection, when He was exalted far above them in rank and dignity, even to the "right hand of power," which is enthroned in light, where dwells the Majesty in the heavens.

Elpis Israel 1.6.

8 Zion heard, and was glad; and the daughters of Judah rejoiced because of thy judgments, O Yahweh.

9 For thou, Yahweh, art high above all the earth: thou art exalted far above all gods.

10 Ye that love Yahweh, hate evil: he preserveth the souls of his saints; he delivereth them out of the hand of the wicked.

11 Light is sown for the righteous, and gladness for the upright in heart.

It means the day of gladness that awaits the sons of God, gladness such as they can never know in the flesh; the gladness of a living union with Christ - a living union with God; not a union by faith, but of actual, manifest, and exhilaratingly-experienced fact.

We do not know what gladness is now. We have never tasted the real joys of existence. It is with difficulty that we pull ourselves along, by reason of our own weakness, physically and mentally, and by reason of the coldness and the darkness of the present evil world.

But joy is appointed nevertheless.

It waits.

Bro Roberts - The cup of Blessing

12 Rejoice in Yahweh, ye righteous; and give thanks at the remembrance of his holiness.