Knowest thou it, because thou wast then born? or because the number of thy days is great? Knowest thou - This is another strong and biting irony, and the literal translation proves it: "Thou knowest, because thou was then born; and the number of thy days is great," or multitudinous, רבים rabbim, multitudes.
Related Commentaries of Job 38:21
Job 38:21
21 Knowest thou it, because thou wast then born? or because the number of thy days is great?