"Cremation" entry in Catholic Encyclopedia: https://www.newadvent.org/cathen/04481c.htm
> By the fifth century of the Christian Era, owing in great part to the rapid progress of Christianity, the practice of cremation had entirely ceased.
> The Christians never burned their dead, but followed from earliest days the practice of the Semitic race and the personal example of their Divine Founder. It is recorded that in times of persecution many risked their lives to recover the bodies of martyrs for the holy rites of Christian burial. The pagans, to destroy faith in the resurrection of the body, often cast the corpses of martyred Christians into the flames, fondly believing thus to render impossible the resurrection of the body. What Christian faith has ever held in this regard is clearly put by the third-century writer Minucius Felix, in his dialogue "Octavius", refuting the assertion that cremation made this resurrection an impossibility: "Nor do we fear, as you suppose, any harm from the [mode of] sepulture, but we adhere to the old, and better, custom" ("Nec, ut creditis, ullum damnum sepulturae timemus sed veterem et meliorem consuetudinem humandi frequentamus" — P.L., III, 362).
Personally the only thing that I consider to be an L as far as heaven goes is the very likely lack of all sex with your spouse for all eternity - even though I know that it is a drop in a bucket compared to what, if anything, will replace it.
It seems that free exists and negative emotions exist in Heaven, at least for the angels.