Hi Ethan, "How far I have come" is referring to the growth or distance that you have covered or achieved. You are right, this is seen as something positive. It is referring to past actions. For example: When I look back on my journey of learning English, I am really proud of how far I have come. For example: When I got my test results back, I had scored really well, it was great to see how far I have come and that all my hard work and practice was worth it. "How far I have to go" is referring to the growth or distance that you will cover or achieve in the future. It can be seen as negative because of the effort that will be needed. For example: I am doing really well in my Spanish classes, but I can still see how far I have to go before I am fluent. For example: I find myself thinking too often of how far I have to go and not appreciating how far I've come. Hope this helps :)

Lori is right except the positive or negative aspect. Coming and going is as Lori said otherwise.