In a general sense, mourning in the Bible represents a state of grief over the lack of desires for good and true ideas about life. This often happens when a church or an aspect of a church has fallen away from the Lord and has been devastated. It can also be when a new church or state of a church is soon to begin, and there is nothing yet in place. In particular, especially when paired with "weeping," "mourning" has do with the loss of all desire for good and the presence of evil; "weeping" in those cases has to do with the devastation of thought and knowledge.
Acts of the Apostles 21:7-8
7
When we had finished the voyage from Tyre, we arrived at Ptolemais. We greeted the brothers, and stayed with them one day.
8
On the next day, we, who were Paul's companions, departed, and came to Caesarea. We entered into the house of Philip the evangelist, who was one of the seven, and stayed with him.
