There are only relative things, not absolute things. Even if there are absolute things at present, it is because we don't know enough about the world and haven't found anything that can be opposed to him. Just like there are many things in ancient books that people thought were absolute at that time, but now they have become relative. Another explanation is that everything is developing and absolute things are static, which is contrary to the theory of material development. This is impossible, so there is no absolute thing.