Thoughts coming from no where?

I like how Lakoff and Johnson incorporate the idea the metaphors are engraved into our daily speech and lives: "They also govern our everyday functioning, down to the most mundane details. Our concepts structure what we perceive, how we get around in the world, and how we relate to other people. Our conceptual system thus plays a central role in defining our everyday realities. If we are right in suggesting that our conceptual system is largely metaphorical, then the way we thinks what we experience, and what we do every day is very much a matter of metaphor."

I also like how they are talking about arguing while using arguing, in a sense, to show that we argue: "Because the metaphorical concept is systematic, the language we use to talk about that aspect of the concept is systematic."

I just want to make their conclusion clear. So we do not conceptualize thoughts and metaphors out of nothing because we develop these concepts and ideas off of other singular ideas. If this is so than how is it that we can conceptualize an idea in the first place? Especially if we have not heard similar thoughts (if those thoughts already exist, which they probably do)? And are we really limited by our surroundings, is it impossible for someone from a different country to think the same way as someone from their home country? Does it make someone better or worse? Who is more justified?