Age-old question

My son fell on the playground a couple of days ago and skinned his knee. Last night at bedtime, he worried out loud about when his "owie" is going to heal.

I assured him that it will, adding that the human body has an amazing capacity to heal itself. "How?" he asked. I struggled to explain -- in a 4-year-old's terms -- about skin cells and how they regenerate. I anticipated his next question, "Mommy, what are cells?" I explained again, as well as I could.

He was quiet for a few minutes, seeming to take it all in. Out popped the next question, "Mommy, why did God make us?"

I often wonder that myself.