Jean has suffered from depression his whole life. In college, he meets a woman, Katrinka, and falls in love. They talk about getting married. Katrinka is always talking about how they will love each other forever and grow old together. Jean cautions, "50% of marriages end in divorce, how do we know that won't be us? We could change. Maybe a prenuptial agreement would be a good idea in case that happens." Katrinka is hurt and outraged at the suggestion. What characteristic of depression is Jean demonstrating that Katrinka has difficulty appreciating?