we must live like Christ is coming back.  and surely He shall.

"Blessed are those who mourn." What can it mean? One can understand why Jesus hails those who hunger and thirst for righteousness, why he hails the merciful, why he hails the pure in heart, why he hails the peacemakers, why he hails those who endure under persecution. These are the qualities of character which belong to the life of the kingdom. But why does he hail the mourners of the world? Why cheer tears? It must be that mourning is also a quality of character that belongs to the life of his realm.
 
"Who then are the mourners? The mourners are those who have caught a glimpse of God's new day, who ache with all their being for that day's coming, and who break out into tears when confronted with its absence. They are the ones who realize that in God's realm of peace there is no one blind and who ache whenever they see someone unseeing. They are the ones who realize that in God's realm there is no one hungry and who ache whenever they see someone starving. They are the ones who realize that in God's realm there is no one falsely accused and who ache whenever they see someone imprisoned unjustly. They are the ones who realize that in God's realm there is no one who fails to see God and who ache whenever they see someone unbelieving. They are the ones who realize that in God's realm there is no one who suffers oppression and who ache whenever they see someone beat down. They are the ones who realize that in God's realm there is no one without dignity and who ache whenever they see someone treated with indignity. They are the ones who realize that in God's realm of peace there is neither death nor tears and who ache whenever they see someone crying tears over death. The mourners are aching visionaries." 
- N.Wolterstorff, Lament for a Son