He was concerned about the safety of the country with Sanai HASHIMOTO as his disciple and it is guessed that his depressed feeling was deepened by persecution of Dutch scholars since Siebold Incident as well as falling of Dutch scholars themselves.
成卿の門人に橋本左内がいたために、国家の安危にも関心を示すようになっていたが、シーボルト事件以来の蘭学者への迫害、さらに蘭学者自体の堕落が成卿の憂鬱を深めたものと推察できる。