This essay argues that the faithfulness of the church in a world with so many vulnerabilities entails that she acknowledges her own vulnerability and frailty. This ecclesial vulnerability is based in the vulnerability of the triune God to whom she witnesses, as well as in the vulnerability of human beings. On the basis of this trinitarian and anthropological vulnerability, suggestions are made regarding the nature, attitude, and public calling of the church. As witnesses and disciples of Jesus Christ, the church has a threefold presence in public life; namely, to be vulnerable prophets, priests, and royals. A vulnerable church is a faithful church, and therefore, a relevant church.