this is insane. i genuinely don't understand why every ambitious person isn't shown this lecture before work starts consuming their entire life. clayton christensen dedicated his career to studying why successful companies collapse. in his final class, he turned that theory on his students: if you keep allocating your time the same way, what life will you eventually build? he had already seen the answer in his own harvard mba class. at the fifth reunion, almost everyone looked successful. by the 10th, 15th, 20th, and 25th, some had stopped coming. behind the empty seats were divorces, broken families, children living across the country, and people who had become wealthy but deeply unhappy. none of them had planned that life. work shows progress today. finish the presentation, ship the product, close the sale, get promoted, watch the number move. an evening with your child may give you nothing you can show the next morning. it may take 20 years before you understand what all those evenings built. so the next free hour goes back into work. the decision feels responsible, and tomorrow it feels responsible again. this is how a life moves in the wrong direction without a single obviously wrong decision. every hour made sense on its own. money, titles, and headcount fit neatly into a spreadsheet. christensen proposed another measure: how many lives became better because you were there? he died in 2020. open your calendar and look at where your time went over the last year. does it match what you say matters? the full 70-minute lecture is in the video below.