The same is true of many other paired expressions. For instance, where the word “joy” occurs, the word “gladness” also occurs, as in the following examples:
Behold, joy and gladness, killing an ox. (Isaiah 22:13)
Joy and gladness will be attained; sadness and moaning will fee. (Isaiah 35:10; 51:11)
Gladness and Joy were cut off from the house of our God. (Joel 1:16)
The voice of joy and the voice of gladness will be done away with. (Jeremiah 7:34; 25:10)
The fast of the tenth will be joy and gladness for the house of Judah. (Zechariah 8:19)
Be glad about Jerusalem; rejoice in it. (Isaiah 66:10)
Rejoice and be glad, daughter of Edom. (Lamentations 4:21)
The heaven will be glad and the earth will rejoice. (Psalms 96:11)
They will make me hear joy and gladness. (Psalms 51:8)
Joy and gladness will be found in Zion, thanksgiving and the voice of singing. (Isaiah 51:3)
There will be gladness, and many will rejoice over his birth. (Luke 1:14)
I will stop the voice of joy and the voice of gladness. The voice of the groom and the voice of bride. (Jeremiah 7:34; 16:9; 25:10)
In this place the voice of joy and the voice of gladness will be heard again, the voice of the groom and the voice of bride. (Jeremiah 33:10-11)
This pair of expressions also occur elsewhere.
Both joy and gladness are mentioned because joy applies to goodness and gladness applies to truth. Joy relates to Love; gladness relates to wisdom. Joy relates to heart; gladness relates to the spirit. Joy relates to the will; gladness relates to the intellect.
The marriage between the Lord and the church is obviously meant here when it mentions the voice of joy and the voice of gladness, the voice of the groom and the voice of bride (Jeremiah 7:34; 16:9; 25:10; 33:10-11). The Lord is the bridegroom and the church is the bride. For the Lord as the bridegroom, see Matthew 9:15; Mark 2:19-20; Luke 5:34-35. For the church as the bride, see Revelation 21:2, 9: 22:17. Therefore John the Baptist said of Jesus, “The One who has the bride is the groom” (John 3:29).
from True Christianity, Volume 1, Section 252