This document discusses the principle of solidarity. It defines solidarity as a feeling of unity and mutual support within a group, as well as a moral virtue requiring commitment to others. The document outlines seven ways solidarity is manifested: working for the common good, striving for justice, recognizing our debt to society, being thankful, forgiving others and reconciling differences, respecting freedom, and focusing on others' needs over our own. It emphasizes solidarity demands unity despite individual differences and a willingness to help all people.