It was a misunderstanding and it preyed on his conscience.

　　這是個誤會，讓他的良心很不安。

　　I give myself treats and justify them to salve my conscience.

　　我治療自己并且糾正他們以慰藉自己的良心。

　　She is that rare bird: a politician with a social conscience.

　　她是這么一種少見的人：有社會良知的政治家。