What does "we all go back so far" mean? Thank you.
Look at the faces of people whom you meet. Each one has an incredible story behind their faces, a story that you could never fully fathom, not only their own story, but the story of their ancestors. We all go back so far, and in this present moment, on this day, all the people you meet, all that life from generations and from so many places all over the world flows together and meets you here like a life-giving water, if you only open your heart and drink.

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Answer

There's a lot in your quote, but with the sentence you've asked about, "we go back far" means we have a long history, usually together. For example: "I've known my best friend since we were five years old. We go back far." This means you have known each for a long time, and you presumably know each other well and have done a lot of things together.

Here, though, it seems like it's saying that everyone has a story. We all have a history that stretches back years, before we meet each other.

Hope this helps!