All the New Testament epistles are, in a sense, a map of life. They start off with the great doctrines, and they give us understanding, insight, intellectual apprehension. There is no more intellectual book in the world than the Bible, but our own intellects will never grasp it until they have been enlightened by the Spirit. It is food for the mind, something to look at for all eternity.
So I can state confidently, and to the glory of God in Jesus Christ, I understand life. I understand myself, and I am not a bit surprised that the world is as it is. I could have prophesied it. I began preaching in the 1920s when people were still optimistic. There had been one world war, but they said, “It is all right; we’ll never do that again.” They were preaching with optimism, and I began preaching chaos and sin and man as he is, and I prophesied that war would come. I simply believed my Bible. I simply accepted the view of life presented there plainly and clearly. Because mankind is sinful there will be wars, and it is just idle fancy and nonsense to imagine that men and women, being self-centered and selfish, will do anything but fight one another in some shape or form. James has said it all: “From whence come wars and fightings among you? come they not hence, even of your lusts that war in your members?” (Jas. 4:1).
There is no difficulty in understanding the world if you are a Christian and if you believe the message of the Bible. It is all there; it is a perfect, complete view of life.
D. Martyn Lloyd-Jones, Seeking the Face of God: Nine Reflections on the Psalms (Kindle Edition)