The criterion that assures unity amid the diversity of liturgical traditions is Question 13 options: fidelity to the improvisational spirit, i.e. the gift of the Holy Spirit within each preacher and congregation. fidelity to apostolic Tradition, i.e., the communion in the faith and the sacraments received from the apostles, a communion that is both signified and guaranteed by apostolic succession. demographic diversity among the clergy who represent Catholics around the world and lead the worship service. diversity within the demographic characteristics of the individual congregation who worships