Investing.com - Rising volatility and declining investor sentiment will make it difficult for stocks to eclipse their January peak.That's the forecast of Morgan Stanley (NYSE:MS).In a note to investors, the Wall Street firm said indicators of both institutional and retail investor sentiment suggest that the January highs will be hard to top.Morgan Stanley said it does not "see anything on the horizon to get investors more bullish than they were after the tax cuts."All the major indices hit record highs in late January, before succumbing to a 10% correction in early February, marked by enormous volatility.Morgan Stanley's forecast is among the more bearish of Wall Street firms.BlackRock and JPMorgan Chase (NYSE:JPM) issued bullish forecasts in the wake of the correction.