In his book, They Found the Secret (Zondervan), former Chancellor of Wheaton College, Dr. V. Raymond Edmond, noticed a pattern in the lives of 20 Christian leaders. After their wholehearted commitment to God (Romans 12:1,2), their came a season of weariness– an awareness of their inability to live victoriously. Then there was a grace awakening related to their union with Christ that gave them increased peace, joy, and fruitfulness.
Dr. John Best, had a similar breakthrough while teaching New Testament Greek at Dallas Seminary. He recounts his spiritual journey in this video. His testimony and others are in the book, Exchanged Lives! (available on Amazon Kindle as an ebook).