You believe there is still sacrifice in heaven? Not that I do not respect your views, I was just raised with the idea that heaven reverts back to before the fall of man. No suffering of any kind. At least from this viewpoint some Christians share, a pain free existence has to have a dramatic effect on the types of love expressed. Especially the concept of sacrifice.
I believe that we can be redeemed from the Fall here on Earth - and that is what the Lord Jesus Christ offers all of us - a remission of sin here and now.
We can never return to the same condition that Adam and Eve enjoyed in the Garden - because we all now have Knowledge of Good and Evil - and with that Knowledge there is always the option of sin.
Therefore - we need to rely on the Lord Jesus Christ- have faith in who He is, what He has done and the promises that He has made - repent of our sins through conscious daily effort - and submit to His authority.
If we do these things humbly and with sincerity - with real intent - we can overcome the natural Man and become a saint through the Atoning Sacrifice of the Lord Jesus Christ.
We sacrifice our fallen nature - we sacrifice our sins - we sacrifice our preferences - to become as He would have us.
Sacrifice does not always mean that we need to suffer - it could only mean that we need to yield - to understand our reliance on the Lord - to accept the reality of our situation - to come to know who and what we are and who and what He is.
If we always did as we should - there would be no pain in the sacrifice that God would require of us - because all He wants us to sacrifice are those things that hurt us and would drag us down to Hell.
That process is painful in mortality - because of the burdens of the flesh which continually war against God and His Christ - but as we commit and yield more to Him - it becomes easier.
As long as we do our best and remain faithful - we can be inheritors of His promises - and there will be no more pain - because there will be no more sin - for we have exercised our free will to submit to Him and His ways - to always choose the Good over the Evil.
The pain-free existence you seek comes with us becoming new creatures in Him - sacrificing the old creatures we once were - and allowing ourselves to change into who we are meant to be.