same as with Ciri's song. You hear it.. you know it is about Geralt. There are some short dialogues within the game where Geralt reveals that he follows the path for to long and that it is time to end.
I know his story.. and I understand why.. But I will miss him and this song reminds me of all the things that happened on the path..
e.g.the wild wyvern that surprises me once and the hard fight to survive (the wyvern was some level over mine...so it was a tough one.. )