The Greek word for "understanding" is VOUV, transliterated as "Nous." In the Greek New Testament, this word appears 24 times and is sometimes translated as "understanding" and other times as "mind," among other meanings.
When the author was preparing to publish this book, they originally intended to title it The Renewal of Nous to indicate that all the quoted scriptures originate from the same Greek term. However, considering that Nous lacks broad recognition and general acceptance, the title was instead finalized as The Renewal of Understanding.
This book emphasizes that believers must have a renewed understanding to progress before God, comprehend the Bible—God’s Word—more deeply, and better understand God’s pleasing will.