From Richard Russell:
A young man who worked for the great J.P. Morgan approached Mr. Morgan. Said the young man, “Mr. Morgan, may I have your advice. I own a portfolio of stocks and it’s not doing well, I can’t think, I can’t eat, I can’t sleep. I worry day and night. What do you think I should do?” Morgan with his fierce demeanor eyed the young man and growled, “SELL TO THE SLEEPING POINT.” That may be the best advice ever given regarding investing. The truth — I’ve often used it.