The incident that persuaded him to become a full-time teacher occurred after he had locked the door of the classroom and checked the dormitories one evening.
雖只是兼課，他的教學絲毫不肯馬虎。有一天晚上十點鐘，就寢的時間到了，林東安把教室的大門鎖上，遠望著學生寢室的燈一個一個熄滅，才回到自己的宿舍。