Reference: Siyar A’laam an-Nubalaa – Volume 4, Page 563
al-Hasan al-Basree said:
O son of Aadam, by Allaah, if you were to read the Qur.aan [with understanding] and then believed in [what] it [contains], your sadness [at what comes to pass] in this world will be lengthened, and your fear [of Allaah] in this world will intensify, and your weeping in this world will increase.