Is it reasonable, in these times of terrorism, wars, migrant refugees, racism and threatening tensions between different groups based on ethnicity, religious and cultural traditions and interpretations, to lean on the potential of education to create mutual trust and a cosmopolitan imagination? This contribution elaborates on deliberation as a way to develop a cosmopolitan curriculum. It also presents clarifications and discussion on the limits of deliberative communication for a moral cosmopolitanism. Finally, this cosmopolitan project based on deliberation is critically analyzed in relation to the challenge from agonism, and three arguments for deliberation are presented, ending up in a thin moral cosmopolitanism.