Speaking personally, I find it helpful to detect in the four evangelists four dimensions of the saving purpose of God: its length, depth, breadth and height.
Matthew reveals its length, for he depicts the Christ of Scripture, who looks back over long centuries of expectation.
Mark emphasizes its depth, for he depicts the Suffering Servant who looks down to the depths of the humiliation he endured.
In Luke it is the breadth of God’s purpose which emerges, for he depicts the Saviour of the world who looks round in mercy to the broadest possible spectrum of human beings.
Then John reveals its height, for he depicts the Word made flesh who looks up to the heights from which he came and to which he intends to raise us.
– John Stott. The Incomparable Christ.