John Wesley on Jeremiah 31:12

And sing - All the phrases in this verse signify one thing, the happy state of the Jews, after their return from captivity. The height of Zion means the temple. A watered garden - They shall be a beautiful, flourishing, and growing people. Soul seems here to be taken for the whole man. Not sorrow - In that manner they have been. But under these expressions is also promised the spiritual joy which the true Israel of God will have under the gospel, and the eternal joy they shall have in heaven.