Augustine of Hippo

..."The Lord is King, let the earth be glad: yea, let the multitude of the isles be joyous" [Psalm 97:1]. It is so indeed, because the word of God hath been preached not in the continent alone, but also in those isles which lie in mid sea: even these are full of Christians, full of the servants of God. For the sea doth not retard Him who made it. Where ships can approach, cannot the words of God? The isles are filled. But 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.