Write a letter to yourself to open in five years. You’ll be surprised what you were sure about.

Certainty does not age well, and you rarely remember having been certain once it has passed. A sealed letter keeps a record you cannot quietly revise. In five years the interesting part will not be the plans, it will be the confidence, and where you spent it.

Write the letter this week and include a few predictions you would bet on. What you will be doing, who you will still talk to, what will matter. Then seal it, put a date on the front, and forget it, so the surprise in five years is honest.