"It appears that man is willing to learn about himself only after some disaster; after war, economic crisis, and political upheaval have taught him how flimsy is that human world in which he thought himself so securely grounded. What he learns has always been there, lying concealed beneath the surface of even the best-functioning societies; it is no less true for having come out of a period of chaos and disaster. But so long as man does not have to face up to such a truth, he will not do so. " (Irrational Man, William Barrett) http://www.philosophymagazine.com/others/MO_Barrett_Irrational.html
Could you please rephrase the blue sentence?
Thank you
Cadzao