Imperturbable is one not Opposing any Pain!

Friends:
Imperturbable is one not Opposing any Pain!

The Blessed Buddha once said to some deadly sick bhikkhus:

Any Bhikkhu should await his time aware and clearly comprehending...

This is our instruction to you! While a bhikkhu lives in this way, aware and clearly comprehending, enthusiastic, keen, and determined, if there arises in him a painful feeling, then he understands this: "There has arisen in me this painful feeling. Now that is dependent, not independent! Dependent on
what?
Dependent on just this contact! But this contact is impermanent, conditioned, and dependently arisen... So when a painful feeling has arisen in dependence on a contact that is impermanent, conditioned, & dependently arisen, how could it ever then itself be permanent?" He dwells in this way always contemplating the impermanence of any contact and the transience of any painful feeling, and he considers thus the inevitable vanishing, fading away, ceasing, & the therefore necessary relinquishment of all conditioned constructions! In this very way is his latent tendency to aversion towards any painful contact & instinctive repulsion of any painful feeling gradually eliminated.

He therefore then understands: With the breakup of this body, at the exhaustion of this fragile life, any feeling, all that is felt, neither being opposed, nor clung to, will cool down right there...