Charles H. Spurgeon on Psalms 102:13

Thou shalt arise, and have mercy upon Zion. He firmly believed and boldly prophesied that apparent inaction on God's part would turn to effective working. Others might remain sluggish in the matter, but the Lord would most surely bestir himself. Zion had been chosen of old, highly favoured, gloriously inhabited, and wondrously preserved, and therefore by the memory of her past mercies it was certain that mercy would again be showed to her. God will not always leave his church in a low condition; he may for a while hide himself from her in chastisement, to make her see her nakedness and poverty apart from himself, but in love he must return to her, and stand up in her defence, to work her welfare. For the time to favour her, yea, the set time, is come. Divine decree has appointed a season for blessing the church, and when that period has arrived, blessed she shall be. There was an appointed time for the Jews in Babylon, and when the weeks were fulfilled, no bolts nor bars could longer imprison the ransomed of the Lord. When the time came for the walls to rise stone by stone, no Tobiah or Sanballat could stay the work, for the Lord himself had arisen, and who can restrain the hand of the Almighty? When God's own time is come, neither Rome, nor the devil, nor persecutors, nor atheists, can prevent the kingdom of Christ from extending its bounds. It is God's work to do it; —he must "arise"; he will do it, but he has his own appointed season; and meanwhile we must, with holy anxiety and believing expectation, wait upon him.