Mistakes. They’re a beautiful mess! To be clear, I’m talking about the kind of mistakes that are life-affirming, not life-altering. We don’t like to make them, yet mistakes are a boundless resource of opportunity and insight. I sometimes wonder if our children are missing out on this. I often find my teenage daughter vacillating between obsessing over her G.P.A. and reminding herself to focus on the process, not the product, of learning. I often remind her that mistakes (i.e., missed ex...