'Bitterness of My Soul' in the Bible

Therefore I will not restrain my mouth; I will speak in the anguish of my spirit; I will complain in the bitterness of my soul.

My soul is weary of my life; I will leave my complaint upon myself; I will speak in the bitterness of my soul.

What shall I say? he has both spoken unto me, and he himself has done it: I shall go softly all my years in the bitterness of my soul.