동시대 다른 척사론이 안정복의 천학고 ·천학문답 등 주로 2차 자료에 의존하였던 데 비해 '척사론'은 김치진이 천주교회에 잠입하여 얻은 천주교서와 그들과 생활하면서 얻은 정보를 바탕으로 한 것이었다.
Whereas other contemporary theories of Cheoksa mainly depended on secondary data such as AAA1's Cheonhak High School and Cheonhakmundap, 'Choksa Theory' was based on the Catholic Church Books obtained by AAA2 by infiltrating the Catholic Church and information obtained while living with them.