Munger isn't simply telling you to stay invested—he's pointing out that our natural impulse to tinker is our greatest enemy. Most people understand that compound interest works; far fewer understand that *stopping yourself from acting* is the hardest part of letting it work. The word "unnecessarily" is the real genius here, because it acknowledges that sometimes you must interrupt compounding (to rebalance, to meet emergencies), but it forces you to prove to yourself that your reason is genuinely necessary and not just the itch to do something. Watch someone with a modest 401(k) over thirty years versus someone who checks their balance daily and adjusts constantly—the difference isn't in their starting salary, but in how many times the first person simply walked away.