Refuse all thoughts except one: the thought ‘I am’. The mind will rebel in the beginning, but with patience and perseverance it will yield and keep quiet.
― Nisargadatta Maharaj
It speaks to a radical method of focusing the mind and ultimately transcending the need for thought itself.
The core idea is to persistently hold onto the fundamental awareness of your own being – the simple, unadulterated "I am" – and to gently but firmly reject all other thoughts as distractions from this primary awareness.
"The mind will rebel in the beginning." Our minds are accustomed to a constant stream of thoughts, worries, memories, and projections. To suddenly restrict it to a single focus can feel unnatural and even agitating. Thoughts will arise, seemingly of their own accord, pulling our attention away from the "I am."
However, the emphasis on "patience and perseverance" is key. It's a process that requires consistent effort and a gentle return to the chosen focus whenever the mind wanders. Like training a wild horse, the mind needs time and consistent guidance to become still.
The ultimate goal is that "it will yield and keep quiet." This suggests that through persistent focus on the "I am," the incessant chatter of the mind can gradually subside. As the mind becomes quieter, our awareness becomes more centred in the fundamental sense of being, potentially leading to deeper insights into the nature of self and reality.
This practice isn't about suppressing thoughts violently, but rather about gently redirecting attention. By continuously returning to the "I am," other thoughts eventually lose their power and the mind naturally settles into stillness.