> A lot of timeless wisdom is also obvious.
As another commenter said, it seems obvious to you because it's been incorporated into our culture.
For instance, I lived in Turkey for a few months, and I had a Turkish roommate who was a devout Muslim. He gave me an English translation of the Qur'an to read, and I gave him a Turkish translation of the New Testament. He decided he would come and show me the places where it must have been changed (since Islam teaches that Jesus was a prophet, but what he says in the New Testament obviously doesn't match what Mohammad said).
What was the first place he found that was obviously changed? Matthew 5:38-39: "You have heard it said, 'Eye for eye, tooth for tooth.' But I tell you, do not resist an evil person. if anyone slaps you on the right cheek, turn to them on the other cheek also."
Well, there's a good example for you: Either that seems like good advice, in which case you certainly got that from your culture; or it doesn't, in which case it's worth chewing over to get some wisdom out of it. :-)