Narrated Anas: The Messenger of Allah, may Allah bless him and grant him peace, said: The most afflicted person in the world will be brought to Paradise, then he will say: Enter him into Paradise well, so that they will admit him to Paradise well.  Then Allaah will say: O children of Adam, have you ever seen hardship or something you dislike?  He will say: No, I swear by your honor I have never seen anything I dislike.  Then the happiest person in the world will be brought to Hell, then he will say: Immerse him in Hell well, then he will say: O children of Adam, have you ever seen anything good and comfortable?  He will say: No, I swear by your honor I have never seen anything good and comfortable.  [Muslim, Ahmad and Ibn Majah] The hadith is saheeh.