Cultural maturity can be measured by whether people have the ability to "criticize" and "laugh at" themselves. The critic says it is because maturity means evaluating yourself calmly and objectively with distance both in society and private life. If you are not satisfied unless you boast the history of your country, it merely shows immaturity of your own society. From essays, "A Way Of Looking At History."
"December 25 2018
from “Oriori no Kotoba” by Kiyokazu Washida, The Asahi Shimbun"