Why were you searching for Me?

"Why were you searching for Me?" He asked them. "Didn't you know that I had to be in my Father's house?" -Luke 2:49
Mary, understandably hurt that Jesus had chosen to hang back in Jerusalem and leave them to worry about His safety, asked Him a question: "Son why have you treated us like this?" Christ's response suggests He was as mystified that they expect to find Him anywhere else as they were mystified to find Him there.
In my opinion, Christ's response was quite interesting. I've searched every Greek translation I can find, and none of my resources have an original word that directly translates to "house" or "business" in verse 49. From what I can gather, a more precise translation of Christ's response might be: "Didn't you know that I had to be about my Father?"
That question implies the desire of my heart more than any other I can imagine. I just want to be about God. Not about ministry. Not about my own agenda. Not about writing books and Bible studies. Not about me at all. When all is said and done, I would give my life for people to be able to say, "She was just about God." That would be the ultimate legacy.
I also consider everything to be a loss in view of the surpassing value of knowing Christ Jesus my Lord. -Philippians 3:8