What did Jesus mean by mourning?
For the sorrow that is according to the will of God produces a repentance without regret, leading to salvation,but the sorrow of the world produces death. For behold what earnestness this very thing, this godly sorrow, has produced in you. (2 cor 7:10-11)
Yet genuine, biblical mourning produces results that are surprisingly wonderful because God does something tangible in response to it - the forgiveness of your sins - a holy infusion of real happiness that breathes into you a sigh of relief.