It is well know that many great people were journaling. But think about journals of great innovators, scientists, mathematicians, chemistry geniuses and etc. Their journals were full of numbers, sketches and drawings. If you take that journal in hands, you will not know what is going on.
Can you imagine those people? They dont think so much in words… They think in numbers, pictures in their head, visions… Can you imagine it? It is different level of thought.