Charles H. Spurgeon on Psalms 97:1

The isles. Figuratively the isles may be taken for all the churches. Why isles? because the waves of all temptations roar around them. But as an isle may be beaten by the waves which on every side dash around it, yet cannot be broken, and rather itself doth break the advancing waves, than by them is broken: so also the churches of God, springing up throughout the world, have suffered the persecutions of the ungodly, who roar around them on every side; and behold the isles stand fixed, and at last the sea is calmed. —Augustine.