Namaskram Swami
Its true that Atma Swaroopam is of GyanaAnandam, however, Atma is struck in samsaram due to past life karmas and that only restricts it to enjoy its true self and because of the Karmas, Atma has to suffer and enjoy both Pain and Pleasure respectively, however it can’t enjoy it directly, it needs a shareeram to experience those.
Now as far as Manas is concerned, it is just a tool to think and create desires when we see , smell, touch, hear and taste substances, it sends signal to Atma then Atma throws light to Bhudhi and Bhudhi with Paguta Arivu chooses whether to accept it or not, So whether it is Manas , Bhudhi ,Indriyas all are Achit ( Gyana shunayam), it is only the Atma( Gyana Ananda Swaroopan) which throws light to Bhudhi to accept what the indriyas show to Manas .
As far as the question, why does a particular part does’nt feel the pain during surgery with sedative provided, is concerned, the samadanam could be, the dharma bhoota gyanam of Atma does’nt reach that particular part, but herein one do feel pain after the surgery is over and also when the sedative restraining power comes down.
Also a non- sequitur, when one practices fast during Ekadesi days, at the begining its like I’ll not survive , but the next morning when the same person wakes up, does his parayanam and breaks his fast, he becomes elated of having followed what Bhagwan desired, so here is the catch during Ekadesi whole day he feels pain and weakness which is true and becomes happy when eats the following morning , the same continues but with stableness the following ekadesis, so its just the ManoVikaram what one experiences but it gets stable and even perfect with continuous Austerities when followed, so that ManoVikaram actually causes displeasure or pleasure in order to carry out , and when one does carry out it effectively and efficiently its not the Manas but the Bhudhi’s Pagutha Arivu, directed by Atma for Anandam of ParamAtma.
Contents above are of Krishnan Swami’s Upanayasams, in case of any mistakes,its completely on Adiyen part .
Kshamika Prathikkaren
Adiyen Dasan