The sea is a picture of the world, the Torah and the Prophets are the rivers of living waters that nourishes the sea, the world. The different types of islands are the different types of churches, ones that protect people from the wrath of the sea and judgments of God by the doctrines of truth. As opposed to the islands or churches that are heretical and not lovers of truth.
The prophets are not just men who hear from God. They were taught the wisdom of God and from that wisdom they were able to prophecy the coming of wars, pestilences and famines. These prophets were taught by God to be holy and righteous. It is the character of the prophet to have the wisdom of God, and to have holiness and righteousness in their life.
Blessed are those who believe without seeing. Some have an issue with believing in the resurrection because they need to physically see someone who has resurrected. However the Father has given us many examples on this earth the process of the resurrection.
Our salvation counts on understanding the prophecies hidden in the sacred Scriptures and the Prophets. They show what has passed and what is to come. Only those who truly see them, become believers. Those who have a reverence to understand what the prophetic Scriptures are saying will create in us an attitude that will help allow us to understand what the Holy Word is saying and will reap the eternal gift form Yah, and will escape eternal damnation.