"There are substantial rewards for adopting a regular routine of investing and following it no matter what, and additional rewards for buying more shares when most investors are scared into selling."-Peter Lynch

The streak is over. For the first time in more than 24 months, the S&P 500 has closed at a record high.

Yet, while much of Wall Street is in party mode, some investors may still feel down in the dumps -- and with cause. That's because while the formal bear market has ended, many portfolios took a serious hit over the last two years. Indeed, some investors might feel that a new all-time high is no time to buy stocks -- it's time to sell them. So, what's an investor to do?

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Source Fool.com