This topic has become in some larger churches a separate department.
I have researched and found two current books that help explain it.
Renovation of the Heart by Dallas Willard published by Navpress in 2002.
The second book is Revolution of Character [Discovering Christ’s pattern for Spiritual Transformation] by Willard and Sampson published in 2005.
In my counseling ministry I am using these book with clients who wish to go deeper in their relationship with the Lord.