Having studied the Vedas, poured libations into fire, performed sacrifices, protected subjects, sanctified his soul by drawing weapons for protecting kine and Brahmanas, and died on the field of battle, the Kshatriya attaineth to heaven. Having studied the Vedas, and distributed in proper time, his wealth among Brahmanas, Kshatriyas, and his own dependents, and inhaled the sanctified smoke of the three kinds of fires, the Vaisya enjoyeth heavenly bliss in the other world.

In plain words: Vidura describes how warriors and merchants reach heaven. A Kshatriya (warrior or ruler) who studies the Vedas, performs sacred rituals, protects his people, cows, and priests, and dies in battle goes to heaven. A Vaisya (merchant or farmer) who studies the Vedas, shares his wealth at the right time with priests, warriors, and those who depend on him, and keeps the sacred fires enjoys heaven after death.