There's many ways that written words are more powerful than spoken words. One of them are relics, journals and even more than that, for example, a slate that is written in ancient language was discovered and has been a great thing for historians to do research and understand how old world worked and developed through time. And in terms of flexibility in meaning too and having multiple complex layers of nuance, the written word is better as it lends more readily to quick repetitions of meaningful review. It's faster to dissect and look from different angles and explore when you can see the words and structure on a physical surface compared to words.