God's command is "Be holy, for I am holy." but as victims of sin's guirrilla warfare, Christians are often prone to give up the fight, or at least to compromise with sin in it's more difficult forms.
JERRY BRIDGES was an author and conference speaker. His most popular book, The Pursuit of Holiness, has sold over one million copies. Jerry was on the staff of The Navigators for over fifty years, and currently served in the Collegiate Mission where he was involved primarily in staff development, but also served as a speaker resource to the campus ministries.
This was very influential to my understanding of sanctification as a teen; I was pleased upon returning to the book to find that it balanced grace and faith well with the call to obedience.