John Cassian, Conferences I–X III.18: That the continual fear of God must be bestowed on us by the Lord

And lastly the prophet Jeremiah, speaking in the person of God, clearly testifies that even the fear of God, by which we can hold fast to Him, is shed upon us by the Lord: saying as follows: “And I will give them one heart, and one way, that they may fear Me all days: and that it may be well with them and with their children after them. And I will make an everlasting covenant with them and will not cease to do them good: and I will give My fear in their hearts that they may not revolt from Me.” Ezekiel also says: “And I will give them one heart, and will put a new spirit in their bowels: and I will take away the stony heart out of their flesh and will give them a heart of flesh: that they may walk in My commandments, and keep My judgments and do them: and that they may be My people, and I may be their God.”