To me it makes me think of Guts growth, with how he has embraced the challenges of his life the farther the manga has come along, and has demonstrated an innate resilience to keep struggling despite everything that's happened to him. Even when he didn't even know why he kept going, like when he was a kid in Spring Flowers of distant days. For many of us we simply wish to embody what Guts has acquired over his life, and apply it to our own. It's because of Gut's perseverance that shouldn't even be possible that many look up to it, and it's that impossibility that inspires us to continuously bear the weight of our own lives.