So I’m replaying God of War again and got to the part where you meet Sindri. While he’s gushing about how great Faye is (which is super adorable), he also mentions that she spoke Dwarven, and he recites a mantra that Faye would occasionally say; it’s the one Atreus finishes and Sindri remarks on how impressive it is that boy knows it. The saying is:

Maðurinn sem gengur eigin vegum hans gengur einn

Which, when translated, means: 

The man who walks his own way walks alone

So even in death, Faye is warning Kratos about the dangers of shutting people out. And, very fittingly, Kratos is the only one in that conversation that has no idea what the words mean.