Two Classes

The warfare against God's law, which was begun in heaven, will be continued until the end of time. Every man will be tested. Obedience or disobedience is the question to be decided by the whole world. All will be called to choose between the law of God and the laws of men. Here the dividing line will be drawn. There will be but two classes. Every character will be fully developed; and all will show whether they have chosen the side of loyalty or that of rebellion.
- Ellen White, Desire of Ages, p. 763

Cain and Abel represent the two classes, the righteous and the wicked, the believers and unbelievers, which should exist from the fall of man to the second coming of Christ. Cain slaying his brother Abel, represents the wicked who will be envious of the righteous, and will hate them because they are better than themselves. They will be jealous of the righteous, and will persecute and put them to death because their right-doing condemns their sinful course.
- Ellen White, Signs of the Times, February 6, 1879, par. 10

You will either live with God in obedience, or you will die with satan in rebellion.