How do the Book of Job, Lamentations, and the Gospel of Mark argue that suffering is a mystery?

How do the Book of Job, Lamentations, and the Gospel of Mark argue that suffering is a mystery?

In his commentary on the Book of Job, Michael D. Guinan states: “Problems are solved. Mysteries are lived.” (Guinan, Michael D. Job. Collegeville Bible Commentary, Vol. 19. Collegeville, MN: The Order of St Benedict, 1986, p. 80) How do the Book of Job, Lamentations, and the Gospel of Mark argue that suffering is a mystery? (You might like to go back to Module 1.7 and relisten to the lecture on Mystery.)
Cite material quoted or paraphrased from the reading assignment to support your argument.