"What Is the Gospel?" by E. J. Waggoner.

Excerpt from article: "Since sin is the transgression of a law, it is evident that to save one from sin, or from the transgression of the law, is the same thing as making and keeping him obedient to the law. Therefore the gospel is the revelation of the power of God to work righteousness in men—to manifest righteousness in their lives. The gospel, therefore, proclaims God’s perfect law, and contemplates nothing less than perfect obedience to it. Let it not be overlooked that it requires no less a power than the power of God, to exhibit righteous acts in the lives of men. Man’s power is wholly inadequate. This is easily seen when we recognize what the righteousness is, that is to be revealed in the life. The text says that it is "the righteousness of God." The righteousness of God is set forth in His law. Isa. 51:6, 7. Now who can do the righteousness of God? That is, who can do acts that are as righteous as those that God does?—Evidently only God Himself. The law of God sets forth God’s way. Ps. 119:1, 2. But the Lord says, "As the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than your thoughts." Isa. 55:9. Therefore man’s effort to keep the commandments of God must fall as far short as the earth is lower than the heavens." 

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