Most Christians have a lousy view of "sanctification."

Many Christians have a great view of justification [how their journey with Christ begins] but a lousy view of "sanctification"  [how their journey and Christian maturity continues].  This is because we don't get across the dividing line of the Cross completely:  We're straddling the Old and the New, and it's killing our hearts.  It's almost irrational:  like a dying cardiac patient being offered a heart transplant, but wanting to keep the old one in, just in case.

Here's a helpful video on this from Andrew Farley, author of The Naked Gospel: