FAITH is necessary to salvation, because we are told in Scripture that works cannot save. To tell a very familiar story, and even the poorest may not misunderstand what I say: a minister was one day going to preach. He climbed a hill on his road. Beneath him lay the villages, sleeping in their beauty, with the corn-fields motionless in the sunshine; but he did not look at them, for his attention was arrested by a woman standing at her door, and who, upon seeing him, came up with the greatest anxiety, and said, “O sir, have you any keys about you? I have broken the key of my drawers, and there are some things that I must get directly.” Said he, “I have no keys.” She was disappointed, expecting that everyone would have some keys. “But suppose,” he said, “I had some keys, they might not fit your lock, and therefore you could not get the articles you want. But do not distress yourself, wait till some one else comes up. But,” said he wishing to improve the occasion, “have you ever heard of the key of heaven?” “Ah, yes!” she said, “I have lived long enough, and I have gone to church long enough, to know that if we work hard, and get our bread by the sweat of our brow, and act well towards our neighbours, and behave, as the Catechism says, lowly and reverently to all our betters, and if we do our duty in that station of life in which it has pleased God to place us, and say our prayers regularly, we shall be saved.” “Ah!” said he, “my good woman, that is a broken key, for you have broken the commandments, you have not fulfilled all your duties. It is a good key, but you have broken it.” “Pray, sir,” said she, believing that he understood the matter, and looking frightened, “what have I left out?” “Why,” said he, “the all-important thing, the blood of Jesus Christ. Don’t you know it is said, the key of heaven is at his girdle; he openeth, and no man shutteth; he shutteth, and no man openeth?” And explaining it more fully to her, he said, “It is Christ, and Christ alone, that can open heaven to you, and not your good works.” “What, minister!” said she, “are our good works useless, then?” “No,” said he, “not after faith. If you believe first, you may have as many good works as you please; but if you believe, you will never trust in them, for if you trust in them you have spoilt them, and they are not good works any longer. Have as many good works as you please, still put your trust wholly in the Lord Jesus Christ, for if you do not, your key will never unlock heaven’s gate.”
So then we must have true faith, because the old key of works is so broken by us all, that we never shall enter Paradise by it. If you pretend that you have no sins, to be very plain with you, you deceive yourselves, and the truth is not in you. If you conceive that by your good works you shall enter heaven, never was there a more fell delusion, and you shall find, at the last great day, that your hopes were worthless, and that, like sere leaves from the autumn trees, your noblest doings shall be blown away, or kindled into a flame in which you yourselves must suffer for ever. Take heed of your good works; get them after faith, but remember, the way to be saved is simply to believe in Jesus Christ.
Without faith it is impossible to be saved, and to please God, because without faith there is no union to Christ. Now, union to Christ is indispensable to our salvation. If I come before God’s throne with my prayers, I shall never get them answered, unless I bring Christ with me. The Molossians of old, when they could not get a favour from their king, adopted a singular expedient; they took the king’s only son in their arms, and falling on their knees, cried, “O king, for thy son’s sake, grant our request.” He smiled and said, “I deny nothing to those who plead in my son’s name.” It is so with God. He will deny nothing to the man who comes, having Christ at his elbow; but if he comes alone he must be cast away. Union to Christ is, after all, the great point in salvation.
Let me tell you a story to illustrate this: the stupendous falls of Niagara have been spoken of in every part of the world; but while they are marvellous to hear of, and wonderful as a spectacle, they have been very destructive to human life, when by accident any have been carried down the cataract. Some years ago, two men, a bargeman and a collier, were in a boat, and found themselves unable to manage it, it being carried so swiftly down the current that they must both inevitably be borne down and dashed to pieces. Persons on the shore saw them, but were unable to do much for their rescue. At last, however, one man was saved by floating a rope to him, which he grasped. The same instant that the rope came into his hand a log floated by the other man. The thoughtless and confused bargeman, instead of seizing the rope, laid hold on the log. It was a fatal mistake: they were both in imminent peril, but the one was drawn to shore because he had a connection with the people on the land, whilst the other, clinging to the log, was borne irresistibly along, and never heard of afterwards. Do you not see that here is a practical illustration? Faith is a connection with Christ. Christ is on the shore, so to speak, holding the rope of faith, and if we lay hold of it with the hand of our confidence, he pulls us to shore; but our good works having no connection with Christ, are drifted along down the gulf of fell despair. Grapple them as tightly as we may, even with hooks of steel, they cannot avail us in the least degree.
Spurgeon, C. H. Words of Wisdom for Daily Living. Bellingham, WA: Logos Bible Software, 2009.