“For the Lord shall comfort Zion: He will comfort all her waste places and He will make her wilderness like Eden, and her desert like the garden of the Lord; joy and gladness shall be found therein, thanksgiving, and the voice of melody.”- Isaiah 51:3

The pedigree of God’s chosen nation Israel may be traced back to one man and one woman-to Abraham and Sarah. Both of them were well stricken in years when the Lord called them, yet, in the fulfillment of His promise, He built up of their seed a great nation, which, for number, was comparable to the stars of heaven. Take heart, brethren; these things are written for our example and for our encouragement. His Church can never sink to so low an ebb that He cannot soon build her up again, nor in our own hearts can the work of grace ever decline so grievously that the same mighty power which once quickened cannot revive and restore us. Think of Abraham and Sarah, childless till they were old, then rejoicing in one son, who became their heir. Hence sprang the great multitude that peopled Palestine. With such a panorama unfolding before you, there is no excuse for despair; but you may find ten thousand reasons for confidence in God.

“The Lord will comfort Zion.” Well He may, for she is His chosen. “The Lord hath chosen Zion.” He would have those upon whom His choice is fixed be glad and happy…He would have His Church rejoice because He has not only chosen her, but He has cleansed her. Jesus has put away the sin of His people by His blood, and by His Spirit He is daily renewing the nature of His children. Sin is the cause of sorrow, and when sin is put away sorrow shall be put away too. The sanctified should be happy. The Lord will, therefore, comfort them:, because He cleansed them. The Church of God is placed where God dwells:-

“Where God doth dwell sure heaven is there;
And singing there should be.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3514.cfm