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As far as simple symbology goes, I'd say the mountains represent what is known, and the snowy abyss of the plain represents what is unknown. To head back to the mountains means possible survival. To head into the abyss means likely death. Yet the abyss calls to you, and that's soul chillingly terrifying.

That's how I see it in my mind's eye when you describe it. I think only you would have the context to interpret the gratitude, however. The immediate association is the connection with your ancestors, yes, but there are other possibilities. One that occurs to me would be an explorer's courage to face that abyss which would simultaneously result in both emotions.

Another possibility is that you were 'really there.' Really looking into the heart of something terrifying. Chosen to stare it down.