Have you ever tried to not think? Well, not in the “I am not going to think about anything” type of way, but not allowing yourself to consciously process thoughts?
They say it is like being the watcher of the thinking mind, rather than being the thinker. You recognise the thought, then dismiss it, leaving your mind free, rather than embroiled in self-talk.
It takes some practice, and yes, discipline, but it allows your brain to switch from being in gear to spinning in neutral. It's not often mine does that.
Breathe.
