51:9-16 The people whom Christ has redeemed with his blood, as well as by his power, will obtain joyful deliverance from every enemy. He that designs such joy for us at last, will he not work such deliverance in the mean time, as our cases require? In this world of changes, it is a short step from joy to sorrow, but in that world, sorrow shall never come in view. They prayed for the display of God's power; he answers them with consolations of his grace. Did we dread to sin against God, we should not fear the frowns of men. Happy is the man that fears God always. And Christ's church shall enjoy security by the power and providence of the Almighty.
11. (Isa 35:10).
Therefore—assurance of faith; or else the answer of Jehovah corresponding to their prayer. As surely as God redeemed Israel out of Egypt, He shall redeem them from Babylon, both the literal in the age following, and mystical in the last ages (Re 18:20, 21). There shall be a second exodus (Isa 11:11-16; 27:12, 13).
singing—image from the custom of singing on a journey when a caravan is passing along the extended plains in the East.
everlasting joy—(Jude 24).
sorrow … flee away—(Re 21:4).