"One of the important things in stocks is that the stock does not know that you own it. You know, you have all theses feelings about it ... you remember what you paid ... you remember who told you about it ... all these little things ... and it doesn't give a damn. It just sits there ... A stock at 50 — somebody has paid 100 for it — they feel terrible — somebody else paid 10 — they fell wonderful. All these feelings — and it has no impact whatsoever. As Charlie says, gambling is the classic example."