Everything that can be known about the Lord Jesus Christ is found in the Bible. There is no other source of materials. One of the proofs that the Bible is the inspired Word of God is that there is no possibility of exhausting it. Each succeeding generation finds the Word as fresh and new as though it were just written. Any study which brings more light from the Book itself, comparing Scripture with Scripture, enhancing and revealing our Lord the more, is sufficiently justified.
When the life and work of Jesus are seen through the first word of John 1:12, "But...", and when His teaching is seen through the parables spoken on that great Saturday afternoon when He sat in a boat on the lake, the whole Bible, from Genesis to Revelation, begins to be a clear and limpid stream of truth. Then even a novice may hope to understand it in its great outlines, and the deepest student will realize that it can never be fully comprehended until we know as we are known.