'Plows' in the Bible

"As when one plows and breaks up the earth, our bones are scattered at the mouth of Sheol."

Does he who plows to sow plow continually? Does he keep turning the soil and breaking the clods?

or does he say it assuredly for our sake? Yes, it was written for our sake, because he who plows ought to plow in hope, and he who threshes in hope should partake of his hope.