This paper builds on a chapter by the speaker in the recent book 'One Earth, One Love' (ed. Paul S. Fiddes, 2025). It draws on the work of the G20 Faith Group in viewing the goals of sustainable development from a variety of religious perspectives. From this base, the paper aims to shape a 'grammar' of engagement of religion in the area of development, taking account of the language and practice of neighbour-love. While the resources for this venture include distinctive themes of Orthodox theology, wider Christian and other traditions are also employed.