Our first reading for today is the famous quarreling of Israel by the waters of Meribah in the book of Exodus. We find the chosen people in the midst of the desert—which is to say, in the process of conversion, on the way from the slavery of sin to the freedom of God. But all conversion takes time; those on the way always tend to look back. And so we hear: “Why did you ever make us leave Egypt?” Here in the very middle of Lent—our own season of conversion—are we finding it hard, annoying, frustrating? Would we rather go back? Probably. But this is the decisive moment: Do we head back to Egypt, to slavery? Or do we trust that the Lord is guiding us?