"To teach with such a seemingly intentional lack of clarity inevitably risks sinning against the Holy Spirit, the Spirit of truth". 

I would suggest that Fr. Weinandy check out the guy who launched this project, what with his sometimes confusing parables. As far as that sin against the Holy Spirit, the only explanation I've ever heard that makes any sense is that it is the failure to forgive. In fact, when we pray The Lord's Prayer, we give God carte blanche to forgive us in the same manner as we forgive others.