The flood assails, and dashes against our walls: may the all-sustaining might uphold them! It falls not as the building of the sand, for I have not built my doctrine upon the sand: a rock shall be for me the foundation, for on Thy rock have I built my faith; the secret foundation of my trust, shall support my walls. For the walls of Jericho fell, because on the sand she had built her trust. Moses built a wall in the sea, for on a rock his understanding built it. The foundation of Noah was on a rock; the dwelling place of wood it bore up in the sea.
Ephraim the Syrian, The Nisibene Hymns: Hymn I
Ephrem the Syrian (ca. 306 – 373 AD) was a Syriac deacon and a prolific hymnographer and theologian of the 4th century. Though lesser known, his works are profound and worth reading. See some of his hymns online at Christian Classics Ethereal Library.