Speech, whether internal or external, tends to reinforce and reify the sense of self. Self-awareness, rather than self-referencing, is recommended. Speech has the possibility of helping to prune, clarify, steady – it can help lead to the end of the person.
Sutta references: AN4:183; M.58:12
The mind becomes crowded with our thoughts, impressions, plans and worries. But what’s the bit that’s not occupied by all of that? Stability and confidence are available in that space, to meet what is arising.