I think it goes "Lost has been part of my journey.. But it also showed me what's precious. So I have a love for which I can only be grateful..."
I can only guess at the author's intended meaning: something like when we things turn out in unexpected ways or we end up in unexpected places, we think about what is most important to us (paraphrase => when I was lost, I learned what was most important in my life). The next line <so I have a love for which I can only be grateful) refers back to what is precious (precious = something we love = most important), and the author is saying s/he is grateful that s/he recognised this precious thing.
An obvious example might be realizing that you love your family when you are far from home. Being lost makes you realize what is precious (your family) and you are grateful to have a family to love.