Dear Jyoti,
What is prarabdha karma? It is the fruit of good and bad happenings arising out of our previous births, and is slated to give
effect this birth.
Now, how does the fruits viz., happiness and sorrow, pleasure and pain, good and evil enjoyed? It is with your mind. When in case of a Jnani, since there is no mind/ego, he does not feel the effects of such happiness and sorrows. His is equilibrium state of life. So in other words, prarabdha karma does not affect a Jnani. Even a sadhak if he or she does self inquiry or self surrender, he becomes a Jnani and the fruits of prarabdha do not affect him. They are no doubt there, but they do not affect him. Like a feeble moon on the high noon. Even it is there, the moon is not useful.
Sri Bhagavan said: When a king dies [say like Dasarata] all his wives become widows. Like that all the three karmas are destroyed, when the ego [king] dies. One cannot say only Kaikeyi is not a widow and Kausalya and Sumitra are widows! This He has explained in some verse in ULLadu Narpadu - Supplement.
Scriptural writings however say, it [the prarbdha] is like an arrow already sent [i.e fixed before your birth] and the arrow may not differentiate between a tiger and a harmless cow. It will hit anything that comes in its path. Here, one should remember that the scriptures say only about prarabdha and not how a Jnani 'feels' about it. Jnani does not "feel" about it. When Sri Bhagavan was in His terminal illness, the pain in sarcoma cancer was unbearable. But He felt the pain very very less. Even there, He said, The body is paining and He did not say, My body is paining. Dr. Guruswami Mudaliar who did surgery for Him has said: It is like a spindle pain. Suppose you rotate a spindle on a wound, how much it would pain that person? He added that the pain would be like a lorry running over your hand. But Sri Bhagavan did not feel that sort of pain. Forwhatever worth, the body was paining and he was moaning. But it is not His body. It is the body.
Arunachala Siva.