This is from an article by Phyllis Kersten published in The Christian Century:
We have choices about how to respond to the mountaintop transfiguration events in our lives. We can ruin them with "if onlys" (if only I could stay here longer; if only things would never change; if only I could relive that experience). We can reminisce about our experiences, caressing and massaging them as an excuse to disengage from the world. Or we can allow them to prepare us for what God calls us to do next.