This had become a major issue with my fiance and I, especially to me, in light of Revelation 21:8. She thinks that if you "lie" for the sake of a joke or a surprise, for example, it is different from lying, and is not a sin. She has also lied about me to protect her parents' opinion of me (they are Russian Baptists, if that means anything in this context). However, when I asked her on the couch weeks ago if she had done a certain thing (not sex) with her ex-boyfriend, she looked me straight in the eyes and lied to me, fearing my anger, and I only finally dug out the truth yesterday. My concern is, maybe the "little lies" for surprises etc. And the "moderate" lies (which I'm quite sure are sin) for a "good cause" like protecting my reputation are numbing her conscience, and leading her to tell serious bold-face lies when there is a strong enough motivator. And also for myself and others, it is important to have a clear understanding about what is sin and what isn't. So, can someone drop some biblical RPC wisdom on me here about where to draw the line?