“If Christians do not develop their own tools of analysis , then when issues come up that they want to understand, they'll reach over and borrow someone else's tools- whatever concepts are generally accepted in their general field or in the culture at large.

But when they do that, Os Guiness writes, they don't realize that "They are borrowing not an isolated tool, but a whole philosophical toolbox laden with tools which have their own particular bias to every problem." They may even end up absorbing an entire set of alien principles without even realizing it.

In other words, not only do we fail to be salt and light to a lost culture, but we ourselves may end up being shaped by our culture.”