many interesting expressions , such as " an arm broken by a sumo wrestler " , or " a son of a merchant who took his father ' s business ruins the business " , can be found in his writing , providing good insights for us to review how the society of the time worked , and to understand fukuzawa himself . 「力士に腕を折られる」や「商家の跡取り息子が身代を潰す」等、福沢諭吉の人間性を見る上でも、当時の世相を見る上でも興味深い表現が多い。