All behaviors that have evolved have done so because of natural selection. Under the spiritual model, life has a purpose. This center is a person's link with God. The ultimate purpose in life is unification with one's spiritual center. Behavior and morality originate from divine law in this framework.
Humanists believe that life has a purpose and that every person has dignity and worth.
They feel that an ideal world of compassion and tolerance can be attained with man-made moral principles. Divine laws are not necessary. Humanists do not believe in a spiritual afterlife. This next exercise may be done in groups of three, in a role-played triad in front of the class, or as an individual writing assignment. Students are to briefly justify each person's actions from the perspective of the materialistic , spiritual , and humanistic world view.