Part of the training to work in a bank involves being able to tell the difference between counterfeit money and genuine currency. This is accomplished, not by studying various types of fakes, but rather, by spending hours upon hours handling the real stuff. This was the basis of a favorite analogy in the Fundamentalist Christian environment I grew up in. The "moral of the story" was, of course, that one did not need to be familiar with other beliefs to be able to share the "Truth". (This applied not only to other religions, but other variations {perversions} of our own Christianity). We were encouraged to remain within the safety of our little bubble, only venturing out in groups, and properly "armed", lest our "Truth" be challenged.
Even as a youngster I was troubled by the implications: if our "Truth" is infallible, can it not withstand a challenge? Am I to assume that everyone that believes differently than I do has malicious intent to deceive me in some way?
Perhaps this well-intended analogy can still be redeemed? I think so. I believe that the analogy is simply incomplete.
It is certainly valid for a banker to spend countless hours studying the very purpose for their existence. It is certainly important for them to be able to quickly identify someone intending to deceive them with a counterfeit. However, I feel that it is also important to recognize that there are other civilizations out there with other currencies that, while different from your own, are not entirely without value. While they may not have any value to you, and may not be valid to make a purchase in your system, they are not necessarily presented to you with intent to deceive. The person carrying that currency truly believes in its value, and there are legitimate civilizations based entirely on that real or perceived value.
So, the moral of my updated version of the analogy is this: you are under no obligation to accept the currency of another culture, but I think it is important to differentiate between those that intend to deceive you and those who are offering you something they legitimately believe is valuable.
To be clear: the original analogy is about how you view the currency you wish to distribute, and how you deal with counterfeit currencies that wish to devalue your own. My version is really about how you will approach the people with different currencies, and whether or not you will devalue them.