Greetings Canon Grace,
For the scripture reference , did you mean 1 John 4:20? I haven't got a copy of the book as yet, but I've added it to my reading list.
I concur with your conclusion as it makes perfect sense. As with the (profound) quote you gave from the book on forgiveness, the condition (true reconciliation) seems to be both "cause" and "effect" of making the "change" to nurture and mend (a) our relationship with God, and (b) our relationships with others. It might seem to be circuar logic, but it really is not as the health (i.e. reconciliation to wholeness) of (a) cannot be complete without the health of (b) and vice-versa.
Peace and blessings,