Christian Doctrine is a Vital part of Christian Growth

I ran across this quote from Christian theologian and teacher Sinclair Ferguson (I noticed this via Dave Harvey, pastor and author, via Twitter).  I did a little bit of additional digging, and it looks like this quote comes from Sinclair Ferguson's book, The Christian Life: A Doctrinal Introduction.

I happen to agree with Sinclair Ferguson on this point - which won't come as much of a surprise if you've spent some time exploring the Brookside Institute blog posts on theology and catechesis.  The question I encourage you to reflect on (and comment on here!) is this: HOW is Christian doctrine "one of the most important growth points of the Christian life"?  Or, stated another way, how will Christian growth be stunted if we neglect Christian doctrine?