I can't see your answer, so here is mine. What it means is, that if you have a problem that cannot be solved, then the only thing you can do is put up with it. In my opinion, it has some truth, but the way that you endure is also important. Some people endure by whinging and complaining. Others endure by finding ways to go forward, even with the problem.

Cf. [1377 Langland Piers Plowman B. x. 439] When must comes forward, there is nothing for it but to suffer; [c 1408 Lydgate Reason & Sensuality (EETS) l. 4757] For thyng that may nat be eschiwed But of force mot be sywed [followed]. And cleanly couer, that cannot be cured. Such il, as is forced, mought nedes be endured. [1579 Spenser Shepherd's Calendar (Sept.) 88] Patience is sorrow's salve; what can't be cur'd, so Donald right areeds [counsels], must be endur'd. [1763 C. Churchill Prophecy of Famine 18] That stupid resignation which some folks preach‥is merely saying—what can't be cured, must be endured. [1870 C. Kingsley Madam How i.] We all have our bad turns. What can't be cured must be endured, you know. [1936 W. Holtby South Riding vi. i.] ‘What cannot be cured must be endured,’ the chained man says, trying to smile. But it comes out as a grimace. [1997 Washington Post 18 Dec. C1] http://www.answers.com/What%20can't%20be%20cured%20must%20be%20endured The enduring is supposed to give us some unique benefit. That benefit is given by the proverb "That which does not kill us makes us stronger" http://www.phrases.org.uk/meanings/proverbs.html http://www.brainyquote.com/quotes/quotes/f/friedrichn101616.html