Originally Posted by outback
Funny you should ask.
This is the reason why we have prophets actually. Their job is to teach you the universal truths. Each prophet talks about the "same" set of universal truths, but each new one had more information than the previous. Not different, but more in depth information. Mohammed is considered better than the previous ones not because he delivered a different message, but the same message in more depth.
So, you've basically reduced the problem of finding universal truths to finding prophets. But, unfortunately, that leads to the same question: How do you know when you are listening to a prophet, as opposed to a total nutjob claiming to be the son of a deity...
in other words, I guess I don't buy this argument, at least not without a better definition of "prophet." So far, the definition is circular: You'll know a universal truth because it comes from a prophet, and you know who the prophets are because they teach the universal truths.