The standard by which saints and sinners are judged will evidently be the revealed will of God. This is not the same for all. Some have been privileged above others, and this naturally adds to their responsibility, Matt 11:21–24; Rom. 2:12–16. This does not mean that there will be different conditions of salvation for different classes of people. For all those who appear in judgment entrance into, or exclusion from heaven, will depend on the question, whether they are clothed with the righteousness of Jesus Christ. But there will be different degrees, both of the bliss of heaven and of the punishment of hell. And these degrees will be determined by what is done in the flesh, Matt. 11:22, 24; Luke 12:47,48; 20:47; Dan. 12:3; II Cor. 9:6. The Gentiles will be judged by the law of nature, inscribed in their hearts, the Israelites of the old dispensation by the Old Testament revelation and by that only, and those who have enjoyed, besides the light of nature and the revelation of the Old Testament, the light of the gospel, will be judged according to the greater light which they have received. God will give to every man his due.
—Louis Berkhof, Systematic Theology (originally Reformed Dogmatics), 733–34.