'Mourning' in the Bible

Thou hast turned for me my mourning into dancing: thou hast put off my sackcloth, and girded me with gladness;

I am troubled; I am bowed down greatly; I go mourning all the day long.

I will say unto God my rock, Why hast thou forgotten me? why go I mourning because of the oppression of the enemy?

For thou art the God of my strength: why dost thou cast me off? why go I mourning because of the oppression of the enemy?