This article introduces the category of spiritual intelligence (SI) as a vital way for religious education to cultivate knowledge and practical wisdom. SI fosters human interconnectedness and promotes a sense of belonging for learners. It helps strengthen learners' identities and creates a just learning environment. The article proposes a version of SI grounded in the ideas of "Koinonia" (communion) in Christianity and "Sangha" (community) in Buddhism, which are useful for learners in both religious traditions and across religions.