His days; the days or (as it follows) months of his life. Are determined; are by thy sentence and decree limited to a certain period. With thee, i.e. exactly known to thee, or in thy power and disposal. Thou hast appointed a certain end of his days, beyond which he cannot prolong his life; and therefore let this short life and unavoidable death suffice for man's punishment, and do not add further and sorer calamities.
Related Commentaries of Job 14:5
Job 14:5
5 Seeing his days are determined, the number of his months are with thee, thou hast appointed his bounds that he cannot pass;