Seneca wrote that death isn’t just some inevitable event in the future. Death is happening right now, he says. The time that passes belongs to death, he reminds us. We can’t take it for granted. We only have so many summers at home together with our kids, as we’ve written. Only so many drives to school. Only so many graduation ceremonies. Every time they wear out a coat, every time they outgrow a pair of shoes or a pair of pants. Those moments mark movement. They are the hash marks of the homemade growth chart on the kitchen door frame. They tick off opportunities for time together that never come back. Don’t waste them!