Prophet Mohammad ((صلى الله عليه وآله وسلم))‏: أَيُّهَا النَّاسِ هَذِهِ دَارُ تَرَحٍ لَا دَارُ فَرَحٍ، وَ دَارُ الْتِوَاءٍ لَا دَارُ اسْتِوَاءٍ فَمَنْ عَرَفَهَا لَمْ يَفْرَحْ لِرَجَاءٍ وَ لَمْ يَحْزَنْ لِشَقَاءٍ. O people! This [world] is the house of pain and not the house of joy, and the house of writhing [in pain] not the house of repose. So he who knows it will neither rejoice for ease and nor will he grieve for misfortune. Bihar al-Anwar, vol. 74, pg. 189 www.firstcau