So, I was thinking about this in the shower (TMI? Lots of people think in the shower), and I think the conflict in the quote you used is about the verb tense of "justified." If one once lived in a big mess, was justified and forgiven, and focuses on that glorious truth exclusively, there's a lack of vision for what to do with the new discipleship. However, if one focuses on their new life more than God's saving (forgiving/justifying), there could be danger of emphasizing works, and forgetting the complete power of God. Rather, if we see "justified" as a status, rather than an event, we carry that boldly (with power, as by new birth) into our futures, and look back at the same time. I have confidence because I am justified. It's not just not that I have been redeemed, it's that I am redeemed.