Charles H. Spurgeon on Psalms 89:40

Hedges and strong holds. Both of these may refer to the appointments of a vineyard in which the king was the vine. It was usually fenced around with a stone wall, and in it was a small house or tower, wherein a keeper was set to keep away intruders. When the wall, or hedge, was thrown down, every passer by plucked at the fruit, and when the tower was gone the vineyard was left open to the neighbours who could do as they would with the vines. When the church is no longer separated from the world, and her divine Keeper has no more a dwelling place within her, her plight is wretched indeed. —C.H.S.