You cannot know the past.  Anyone who ever wrote anything has something they are trying to convince you of (lol).  Even their diary is colored by their biases.

Obviously you cannot know the future.

And you will never be able to know the future.  Just like you cannot know what God is like right now: you could spend 1000yrs face to face with one God, and both of you find out there is another higher than they.

And that next God might be good, or might be bad, or might be trying to fool you that they are the opposite.  This struggle to understand will never end, for as long as we have consciousness.

Truth is, we don't even know there IS a future.  Your soul can never be certain you have made it through to Finality.  The only thing that you have, the only thing that you will ever have, is Right Now.  

I hope that you keep your Right Now filled with Honor, Integrity, and Dignity (and myself I hope that is through honesty of humble Love and Care for others), the absolute best that you can.  That is what Heaven is then, and that can be your's right now.

Forever.