Change of Plans

I received an email from Betty the other day and she asked if I would consider teaching the book of Ephesians next month. I had already purposed in my heart after praying about this that I would teach what Betty thought was best. I emailed her back and said I would indeed teach Ephesians but I do need 10 weeks because the previous four times I taught this book I needed at least 10 weeks. She emailed back and said that would be great.
I knew I was set on teaching Justification by Faith Alone and Sola Scriptura this spring but it looks like the Lord would have me teach Ephesians and change my plans.