'Mourning' in the Bible

Thou hast turned my mourning to dancing for me, Thou hast loosed my sackcloth, And girdest me with joy.

As if a friend, as if my brother, I walked habitually, As a mourner for a mother, Mourning I have bowed down.

I have been bent down, I have been bowed down -- unto excess, All the day I have gone mourning.

I say to God my rock, 'Why hast Thou forgotten me? Why go I mourning in the oppression of an enemy?

For thou art the God of my strength. Why hast Thou cast me off? Why mourning do I go up and down, In the oppression of an enemy?