Has Jesus saved me?

Has Jesus saved me? I dare not speak with any hesitation here; I know He has. His Word is true, therefore I am saved. My evidence that I am saved does not lie in the fact that I preach, or that I do this or that. All my hope lies in this that Jesus Christ came to save sinners. I am a sinner, I trust Him, then He came, to save me, and I am saved; I live habitually in the enjoyment of this blessed fact and it is long since I have doubted the truth of it, for I have His own Word to sustain my faith. It is a very surprising thing,—a thing to be marvelled at most of all by those who enjoy it. I know that it is to me even to this day the greatest wonder that I ever heard of, that God should ever justify me. I feel myself to be a lump of unworthiness, a mass of corruption, and a heap of sin apart from His almighty love; yet I know, by a full assurance, that I am justified by faith which is in Christ Jesus, and treated as if I had been perfectly just, and made an heir of God and a joint-heir with Christ; though by nature I must take my place among the most sinful. I, who am altogether undeserving, am treated as if I had been deserving. I am loved with as much love as if I had always been godly, whereas aforetime I was ungodly.

I have always considered, with Luther and Calvin, that the sum and substance of the gospel lies in that word Substitution,—Christ standing in the stead of man. If I understand the gospel, it is this: I deserve to be lost for ever; the only reason why I should not be damned is, that Christ was punished in my stead, and there is no need to execute a sentence twice for sin. On the other hand, I know I cannot enter Heaven unless I have a perfect righteousness; I am absolutely certain I shall never have one of my own, for I find I sin every day; but then Christ had a perfect righteousness, and He said, "There, poor sinner, take My garment, and put it on; you shall stand before God as if you were Christ, and I will stand before God as if I had been the sinner; I will suffer in the sinner's stead, and you shall be rewarded for works which you did not do, but which I did for you." I find it very convenient every day to come to Christ as a sinner, as I came at the first. "You are no saint," says the devil. Well, if I am not, I am a sinner, and Jesus Christ came into the world to save sinners. Sink or swim, I go to Him; other hope I have none. By looking to Him, I received all the faith which inspired me with confidence in His grace; and the word that first drew my soul—"Look unto Me,"—still rings its clarion note in my ears. There I once found conversion, and there I shall ever find refreshing and renewal.

From Spurgeon's Autobiography, The Great Change - Conversion