'Bitterness of My Soul' in the Bible

Therefore I will not refrain 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 hath both spoken unto me, and himself hath done it: I shall go softly all my years in the bitterness of my soul.