He meant that any social custom or system is similar to that of nature, while they have been derived from proper reasoning and necessity, therefore unreasonable attempt at changing them would inevitably lead to a strong resistance.
それは、社会の習慣や制度は生物と同様で相応の理由と必要性から発生したものであり、無理に変更すれば当然大きな反発を招く。