Psalms 119:20

My soul breaketh -This word means to break; to crush; to break in pieces by scraping, rubbing, or grating. The idea would seem to be, not that he was crushed as by a single blow, but that his soul - his strength - was worn away by little and little. The desire to know more of the commands of God acted continually on him, exhausting his strength, and overcoming him. He so longed for God that, in our language, “it wore upon him” - as any ungratified desire does. It was not the possession of the knowledge of God that exhausted him; it was the intenseness of his desire that he might know more of God. For the longing -For the earnest desire.