A recent writer has pointed out that sin, like death, is not seriously realized except as a personal fact. We really know it only when we know it about ourselves. The word "sin" has no serious meaning to a man, except when it means that he himself is a sinful man. And hence it comes to pass that we can still turn to the penitential Psalms, to the seventh chapter of Romans, to the _Confessions_ of St. Augustine, or to the _Grace Abounding_ of John Bunyan, and make their words the language of our own broken and contrite hearts. For when Bunyan and Augustine and Paul and the psalmists spoke of sin, they spoke not the thoughts of others, but their knowledge of themselves; they looked into their own hearts and wrote. That is why their words "find" us to-day. Nevertheless, paradox though it may seem, our greatest Teacher concerning sin, Himself "knew no sin." Born without sin, living and dying without sin, Christ yet "knew what was in man," knew the sin that was in man, and from His own sinless height once for all revealed and judged and condemned it. Let us seek, then, to learn the mind of Christ on this great matter. And once more, as I have had occasion to point out in a previous chapter, we must not look for anything formal, defined, systematic in Christ's teaching. We cannot open the Gospels, as we might some modern theological treatise, and read out from them a scientific exposition of sin--its origin, its nature, its treatment. The New Testament is not like a museum, where the flowers are dried and pressed, and the fossils lie carefully arranged within glass cases, and everything is duly classified and labelled. Rather it is like nature itself, where the flowers grow wild at our feet, and the rocks lie as the Creator's hand left them, and where each man must do the classifying and labelling for himself. Museums have their uses, and there will always be those who prefer them--they save so much trouble. But since Christ's aim was not to save us trouble, but to teach us to see things with our own eyes, to see them as He saw them, and to think of them as He thinks, it is no wonder that He has chosen rather to put us down in the midst of a world of living truths than in a museum of assorted and dead facts. I What, then, is the teaching of Jesus concerning sin? His tone is at once severe and hopeful. Sometimes His words are words that shake our hearts with fear; sometimes they surprise us with their overflowing tenderness and pity. But however He may deal with the sinner, we are always made to feel that to Jesus sin is a serious thing, a problem not to be slurred over and made light of, but to be faced, and met, and grappled with. Christ's sense of the gravity of sin comes out in many ways.