John Cassian, Conferences I–X III.14: That knowledge of the law is given by the guidance and illumination of the Lord

The knowledge also of the law itself they daily endeavour to gain not by diligence in reading, but by the guidance and illumination of God as they say to Him: “Show me Thy ways, O Lord, and teach me Thy paths:” and “open Thou mine eyes: and I shall see the wondrous things of Thy law:” and “teach me to do Thy will, for Thou art my God;” and again: “Who teacheth man knowledge.”