Charles H. Spurgeon on Psalms 15:2

"And worketh righteousness." A man must first be righteous before he can work righteousness of life. "He that doeth righteousness is righteous, even as he is righteous." 1 John 3:7. The tree makes the fruit, not the fruit the tree; and therefore the tree must be good before the fruit can be good. Matthew 7:18. A righteous man may make a righteous work, but no work of an unrighteous man can make him righteous. Now we become righteous only by faith, through the righteousness of Christ imputed to us. Romans 5:1. . . . Wherefore let men work as they will, if they be not true believers in Christ, they are not workers of righteousness; and, consequently, they will not be dwellers in heaven. Ye must then close with Christ in the first place, and by faith receive the gift of imputed righteousness, or ye will never truly bear this character of a citizen of Zion. A man shall as soon force fruit out of a branch broken off from the tree and withered, as work righteousness without believing in, and uniting with Christ. These are two things by which those that hear the gospel are ruined. Thomas Boston.