To grow in godliness

Here's a good summary of the need for active sanctification (which is what the Work basically guides one in):

"It's not uncommon for an accomplished musician to be able to sit down in front of a new piece of music and play it through without a hitch. It seems easy, as if playing required no effort. Yet, the 'freedom' to play with such skill comes only after years of disciplined practice.

In the same way, the freedom to grow in godliness--to naturally express Christ's character through your own personality--is in large part dependent on a deliberate cultivation of the spiritual disciplines.

Far from being legalistic, restrictive, or binding, as they are often perceived, the spiritual disciplines are actually the means to unparalleled spiritual liberty."

This quote is from a site with book recommendations. The book in question I know nothing about, but here's the title: Spiritual Disciplines for the Christian Life by Don Whitney. Here's the site itself.