Personally I think that grammar is a way to attain Beauty. When you speak, or read, or write, you can tell if you've spoken or read or written a fine sentence. You can recognise a well-tuned phrase or an elegant style. But when you are applying the rules of grammar skilfully, you ascend to another level of the beauty of language. When you use grammar you peel back the layers, to see how it is all put together, to see it quite naked, in a way.