This consciousness of sin and cry for pardon lie at the foundation of vigorous practical religion. It seems to me that the differences between different types of Christianity, insipid elegance and fiery earnestness, between coldness and fervour, the difference between a sapless and a living ministry and between a formal and a real Christianity, are very largely due to the differences in realising the fact and the gravity of the fact of transgression. The prominence which we give to that in our thoughts will largely determine our notions of ourselves, and of Christ's work, and to a great extent settle what we think Christianity is for, and what in itself it is. If a man has no deep consciousness of sin he will be satisfied with a very superficial kind of religion. 'Every man his own redeemer' will be his motto. And not knowing the necessity for a Saviour, he will not recognise that Christianity is fundamentally and before anything else, a system of redemption. A moral agent? Yes! A large revelation of great truth? Yes! A power to make men's lives, individually and in the community, nobler and loftier? By all means. But before all these, and all these consequentially on its being a system by which sinful men, else hopeless and condemned, are delivered and set free. So, dear brethren! let me press upon you this,--unless my Christianity gives large prominence to the fact of my own transgression, and is full of a penitent cry for pardon, it lacks the one thing needful, I was going to say--it lacks, at all events, that which will make it a living power blessedly ruling my heart and life. II. Note in the next place the plea for pardon. 'For Thy name's sake.' The Psalmist does not come with any carefully elaborated plea, grounded upon anything in himself, either on the excuses and palliations of his evil, his corrupt nature, his many temptations, and the like, or on the depth and reality of his repentance. He does not say, 'Forgive me, for I weep for my evil and loathe myself.' Nor does he say, 'Forgive me, for I could not help doing it, or because I was tempted; or because the thing that I have done is a very little thing after all.' He comes empty-handed, and says, 'For Thy name's sake, O Lord!' That means, first, the great thought that God's mercy flows from the infinite depths of His own character. He is His own motive. The fountain of His forgiving love wells up of itself, drawn forth by nothing that we do, but propelled from within by the inmost nature of God. As surely as it is the property of light to radiate and of fire to spread, so surely is it His nature and property to have mercy. He forgives, says our text, because He is God, and cannot but do so. Therefore our mightiest plea is to lay hold of His own strength, and to grasp the fact of the unmotived, uncompelled, unpurchased, and therefore unalterable and eternal pardoning love of God.