20, 21. this night, &c.--This sudden cutting short of his career is designed to express not only the folly of building securely upon the future, but of throwing one's whole soul into what may at any moment be gone. "Thy soul shall be required of thee" is put in opposition to his own treatment of it, "I will say to my soul, Soul," &c.
      whose shall those things be, &c.--Compare Ps 39:6, "He heapeth up riches and knoweth not who shall gather them."

JFB.