It's a beautiful idea to focus on how everything is temporary and always in flux. It may feel bad now, but it will feel good later, and vice versa. To write about those things brings this satisfying feeling as a creative person. There's a lot of music out there that's like, "I'm so mad! I'm sad! I'm into skulls and crossbones and the color black," and that's just meaningless and shallow. So much of metal is about that and it's hard to find metal that is substantial and meaningful in terms of its content.