I usually take the position that the source of wisdom (which I believe to be GOD) is a necessary component of the value of that wisdom.
God told Marshal Applewhite to gather the folk and to abandon these husks. Great source, shitty message.
It does not matter what the source is, you need to test the message against reason, logic and reality. God tells you to get a gun and go kill folk, you test message, decide it is stupid, say "Sorry big guy, no thanks."
In order to tell a good story around a campfire, one needs either:
# experience
# good teachers (such as other storytellers, which leads to the question of the source of wisdom for the very first storyteller)
# Common sense (which usually is found through observation, logic, reason, and experience of reality).
I guess my question is this: How can a good storyteller have good content without having good source(s)?
Basically all those are internal. You gather experiences by being a good observer. Those who simply float through this life don't really experience much of it. Observing, listening, like critical thinking are skills you learn.
The first storyteller gained his talent the same way the last storyteller will.
The thing you left out, and it is VERY important, is that to be a storyteller you also need imagination, you take ordinary, mundane, everyday things and embellish them. Some friends meet on the beach for a fish fry becomes they meet for a fish fry but forgot the fish. They pull in a net and wow, it is full of fish.
Imagination and embellishment.
Immigration has been a problem
Since 1607!