It was reported from Abu Al-Darda - May Allah SWT be pleased with him- that he said. "Three make me laugh, and three make me cry.
Those that make me laugh are a person who puts his hopes in this worldy life wile dealth persues him, a person who is heedless [of his Lord] while [his Lord] is not heedless of him, and a person who always laughs while he does not know whether he has pleased Allah or angered him.
What makes me cry is being seperated from my beloved: Muhammed and his party (the Companions), the horrors of the time of death, and the standing in from of Allah 'azza wa jall on the Day when the secrets will be revealed and I do not know will I then go to Paradise or Hell?"
[Ibn Al-Mubrarak, Al-Zuhd wa Al-Raqa' iq article 250]