Religious communities know that persons and communities are inseparable. This means that true sustainable development must engage both persons and their communities. We ignore this profound reciprocity at our peril. To nourish and strengthen vital communities, religions advance social virtues like trust, seeking the common good and an abiding sense of responsibility for others animated by unrestricted Love and Compassion. Again, these social virtues help generate what economist have begun to call the "social capital" essential for development, William F. Vendley said at the UN Special Event on World Interfaith Harmony: Multi-religious Partnership for Sustainable Development.