This article analyses the Ecos sagrados de la fama gloriosa de Innocencio xi, an elaborate panegyric by the Spanish priest and musician Gaspar Sanz written in 1681 in praise of the reigning pope. The Ecos sagrados is built around the concept of an echo poem, which in turn inspires seven prose discourses that reflect on aspects of the pope's name and character. However, the text is also a unique resource for tracing transmission of ideas through the Spanish Church and for encountering a forgotten world of intellectual diversion amongst the priests of Baroque Madrid.