Gordon Allport was an early psychologist who studied personality. He asserted that humans have an innate propensity for prejudice stemming from a tendency to overgeneralize. Prejudice refers to negative attitudes toward others based on their group membership and lacking an individual assessment. It can involve avoidance, aversion or violence against members of other groups based on attributes such as race, religion, gender, age or appearance. Major world religions and organizations like UNESCO promote tolerance, justice and basic human rights to counter prejudice. Educating for tolerance recognizes others' rights to their identities and aims to reduce discrimination and exclusion.