Faced with the ongoing tragedy of poverty, ethicists call for effective measures of global justice to set up just institutional structures. Their arguments for a transnational obligation to help however remain contested, one of the main reasons for that being the lack of motivational support for trans-national visions of global justice. This articles suggests that the debate will gain new and helpful insights if it studies the motivational mechanisms at work in the dominant religious and cultural traditions, asking: How do (...) these particular traditions conceive of social justice; how do they motivate their adherents to extend solidarity? And how can the similarities surfacing in their motivational strategies be informative for the quest to devise a motivationally saturated account of global justice? The article demonstrates the potential of such an concrete-universal discourse in an exemplary manner by staging a dialogue between public Christian Social Ethics and African Ubuntu Ethics. (shrink)