To me thinking is primary tool of communication between I and “me” and it’s entirely based on sound and language.
Can you think without using language?
When you have song playing in your head, how is that different from your thoughts?
Isn’t talking out loud just act of thinking, the output being connected to mouth?
Have you ever tried to repeat mantra in your thought, slow down until coming to full stop? What remains when thinking stops?
Have you noticed that thinking is like breathing, in a way that it’s happening automatically and you can also take over?
Have you noticed that thinking consciously is linked with breath and being aware of space?
Fascinating topic!