The end of a marriage ranks among the most painful of psychological experiences, and many people in dissolving marriages have no doubt proclaimed that they will never wed again. Although half of all marriages end in divorce, countless couples exchange marital vows each week secure in the belief that they will defy the odds and their own marriage will last. Are people always so positive about the future? Do people sometimes shelve their positive future outlook in favor of a more negative outlook?In this chapter, we explore how people think about the future and note that people sometimes fluctuate from moment to moment in their future outlooks. We then address the intriguing question of why people hold positive future outlooks one moment yet hold negative future outlooks another moment. We propose that a fundamental need-the need for preparednesscaptures much of the fluctuation in predictions across time (Carroll, Sweeny, &. Shepperd, 2006). We suggest that realistic and negative outlooks serve preparedness by advancing self-criticism goals around accurate detection of 161