We are our own Heaven and Hell, and catalyst for such to reach our world. Peace, calmness, bliss, happiness, and love, those are what makes us into a very incarnate of heaven itself, and through us heaven spreads onto this world.
Regret, doubt, anger, greed, and hatred are what make us into the very incarnations of hell, portals to allow it to infect, decay, and burn our world to ashes.
Remember this, and strive against our flaws towards our virtues, for there is no such thing as human nature, we are not, in anyway, bound by some genetic, mental, emotional, nor spiritual Law. We turn change our world into either heaven or hell by choice.