Jamieson, Fausset and Brown on Lamentations 2:13

13. What thing shall I take to witness--What can I bring forward as a witness, or instance, to prove that others have sustained as grievous ills as thou? I cannot console thee as mourners are often consoled by showing that thy lot is only what others, too, suffer. The "sea" affords the only suitable emblem of thy woes, by its boundless extent and depth (La 1:12; Da 9:12).

Nun.