"My best efforts were some modern things that looked like very lousy Matisses. Thank God I had the sense to realize they were lousy, and leave Paris."

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There's no use diversifying into unknown companies just for the sake of diversity. A foolish diversity is the hobgoblin of small investors. That said, it isn't safe to own just one stock, because in spite of your best efforts, the one you choose might be the victim of unforeseen circumstances. In small portfolios, I'd be comfortable owning between three and ten stocks.

— Peter Lynch