I think that we mix these two concepts up too easily. Because of grace given to us, we think that God is a soft god. A god that easily forgives, that he has a "tak ada apa" attitude towards sin.
I've seen Christians and even admit that I have mixed these things up. Just because we are meant to be gracious, it doesn't mean that we cannot be strict.
When I saw the code of ethics from the Project Management Institute, I realized that the code involved both respect for the culture of the people that you're working with but yet, also maintaining the highest level of ethics. Just because a culture allows or even condones corruption does not mean that you have to adhere to it.
The code of ethics even prescribes doing something that the "I, me, and myself" mentality goes against. It describes doing good even if others don't reciprocate the same things. The Golden Rule also applies to business too: Item 3.2.4 "We conduct ourselves in a professional manner, even when it is not reciprocated."
The Project Management Institute's (PMI) code of ethics can be found here.