Social work values social justice, as the profession promotes the well-being of society and the rights each person holds. Although social justice is a core value of social work, it is necessary to address the value’s foundation, and questioning the “why” behind social justice calls for a deeper understanding of social work. Using the “Inside-Out” apologetic approach demonstrates how the secular grounding of social work neglects to provide the foundation required to make claims on the necessity of social justice. A Christian foundation, however, offers the grounding needed to support the values and mission of social work, and it is valuable to support a Christian understanding of social work