"The majority of unskilled investors stubbornly hold onto their losses when the losses are small and reasonable. They could get out cheaply, but being emotionally involved and human, they keep waiting and hoping until their loss gets much bigger and costs them dearly."

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The idea that you try to time purchases based on what you think business is going to do in the next year or two, I think that's the greatest mistake that investors make because it's always uncertain. People say it's a time of uncertainty. It was uncertain on September 10th, 2001, people just didn't know it. It's uncertain every single day. So take uncertainty as part of being involved in investment at all. But uncertainty can be your friend. I mean, when people are scared, they pay less for things. We try to price. We don't try to time at all.

— Warren Buffett