'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 give free course to my complaint; I will speak in the bitterness of my soul.

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