Which do you think came first, grammer rules or language?

I think that language is more important than grammar rules. Basically, if people could understand what I am trying to convey, then, there is no problem for my own self. Though my elder sister was major in British English, I always see languages as a tool, even tone is more important than grammar rules! I use languages to learn more in other aspects, such as reading English novels or magazines, so I know much more about the world. To sum up, if a language can help me to get other acknowledge, I would happy to learn, but only a tool! Never get stock in grammar rules!