"He will wipe every tear from their eyes. There will be no more death or mourning or crying or pain, for the old order of things has passed away. I am making everything new!" (Revelation 21:4-5)
What is the answer to this riddle of the mourners being blessed by comfort? We mourn in our emptiness and purposelessness and pain, and are comforted by Jesus' salvation and the presence of his Spirit. We mourn with Jesus, too, and are comforted by his Return and the consummation of his Reign.
These are words of comfort and to me they are a promise of better things to come but how do you answer a person who has given up (poor in spirit) yet believes these words. My niece committed suicide and from conversations with her I think she wanted no more death or crying or pain and chose to go to Jesus. I know it's not what Christ was teaching but that's as far as she got in her walk.