Also see: Self-Liberation by Khamtrul Rinpoche III
Khamtrul Rinpoche on the realization of anatta in the Mahamudra text (recommended reading! with lots of pointers for contemplation too):
"At that point, is the observer—awareness—other than the
observed—stillness and movement—or is it actually that stillness and
movement itself? By investigating with the gaze of your own awareness,
you come to understand that that which is investigating itself is also
no other than stillness and movement. Once this happens you will
experience lucid emptiness as the naturally luminous self-knowing
awareness. Ultimately, whether we say nature and radiance, undesirable
and antidote, observer and observed, mindfulness and thoughts, stillness
and movement, etc., you should know that the terms of each pair are no
different from one another; by receiving the blessing of the guru,
properly ascertain that they are inseparable. Ultimately, to arrive at
the expanse free of observer and observed is the realization
of the true meaning and the culmination of all analyses. This is called
“the view transcending concepts,” which is free of conceptualization,
or “the vajra mind view.”
"Fruition vipashyana is the correct realization of the final conviction of the nonduality of observer and observed."
Khamtrul Rinpoche III. The Royal Seal of Mahamudra: Volume One: A
Guidebook for the Realization of Coemergence: 1 (p. 242). Shambhala.
John Tan commented on the above:
[9:14 PM, 6/20/2020] John Tan: This is not just mere experience.
[9:15 PM, 6/20/2020] John Tan: It sees through the conventions and analysis and realized the emptiness of these conventions...
[7:52 PM, 6/20/2020] John Tan: Until the meditator or agent disappears for good.
[7:53 PM, 6/20/2020] John Tan: Few integrate total exertion and DO into anatta (except Dogen) as the right view, pretty sad.
[7:54 PM, 6/20/2020] John Tan: But there r some articles that r really good by some tibetan masters.
[7:58 PM, 6/20/2020] Soh Wei Yu: which articles?
[8:02 PM, 6/20/2020] John Tan: I was scanning through our blog and found one article u posted about resting in the 6 senses. Forgotten by which karmapa.
[8:03 PM, 6/20/2020] Soh Wei Yu: oh.. this one https://awakeningtoreality.blogspot.com/2015/12/self-liberation-by-khamtrul-rinpoche-iii.html
[8:05 PM, 6/20/2020] John Tan: U r good at finding🤣🤣🤣
[8:05 PM, 6/20/2020] John Tan: Next time I can just ask u...
[8:05 PM, 6/20/2020] John Tan: Lol