Kant's categorical imperative holds that people should act based on a sense of duty rather than for rewards or consequences. The categorical imperative is to act solely from duty, whereas the hypothetical imperative involves acting to receive a reward. According to Kant, the categorical imperative is the only proper way to act. He gives the example of helping an elderly woman cross the street purely out of duty rather than for personal reward or feeling good. Kant believed people should strive for the highest good or "summum bonum," which involves achieving happiness through virtue, though this can only be attained after death.