Another kind of mourning is acceptable human mourning. This kind of mourning encompasses all the legitimate sorrows that are common to mankind. It is perfectly proper to mourn over events that bring us sorrow. The death of a loved one brings mourning. News of the sickness of someone we love also brings mourning.
Many tragic events bring mourning.
These are legitimate expressions of the human condition. But while Jesus' comfort extends to these situations, there is a more specific application to make concerning the mourning He had in mind. The kind of mourning of which Jesus is speaking here may be called godly sorrow, or godly mourning. It is that mourning over our spiritual condition that leads us into a deeper relationship with God. For behold what earnestness this very thing, this godly sorrow, has produced in you.