THEOSISPhilaret of Moscow (Drosdow)
The practice within the Church on earth of calling upon the saints in Heaven during prayer is rooted in Holy Tradition, which finds its foundations in Holy Scripture as well. A notable instance of this is when the prophet David implores, ‘Lord God of Abraham, Isaac, and Israel our fathers,’ thereby invoking the saints to bolster his supplication (1 Chron. 29:18).