So the language that different early Christians used about each other, and for themselves,was sometimes very common Greek language, but sometimes it would've also sounded strange and kind of in-house to other people.

所以早期基督教徒所使用的不同的,互称或自称的称谓，有些其实是普通的希腊语，但有时听起来很奇怪,对其他人来说像黑话。

耶鲁公开课 - 新约课程节选