If you are saying that God has forgiven you - how do you KNOW?
This is an interesting question. Before Christ, I would have to say that I couldn't be sure, but could guess/hope that my various animal sacrifices might make a difference. (And it seems I needn't be Jewish to have a sacrifice mentality--here's another odd idea that people have all over the world, the need for sacrifice--)
But I would say that it has roots in the veracity of the death and resurrection of Christ. I think it's rather amusing how people apply theories for Jesus that they would never apply to anyone else in history, simply because the ramifications of his resurrection being true means that We Are Not Alone Afterall.
(BTW, I used to think a person could kill himself and offer that to God. But a pig is not acceptable as a sacrifice, and a pig is less sinful than a man. The only acceptable sacrifice must be sinless, and Jesus filled that bill.)
God is not limited by time or space. Jesus said that his death was for all people--"whosoever"; Paul mentions that my salvation is to come thru trusting that Jesus said it was all done and paid for. In deciding to have faith, my experience has confirmed it.
Another note. Someone believes that if they have good thoughts, they begin to feel better about themselves. This is only the case if one has something worse: idiotic pride--a condition that nullifies all your good works. The truth is, the more I realizes how good God is, the more my own little charade is exposed! ...and then I wonder anew at how God ever puts up with me. And I appreciate Him a lot more.
What is love, then? How do we love our wife/husband? If our wife/husband refuses to do as we wish, do we cut them loose? If they won't keep us happy, do we leave? If we feel that marriage isn't rewarding us, do we leave? What conditions do we have? Why are we always ascribing our own methods to God? Why do we talk as experts about God's love when our understanding of it is so poor?
I'm afraid by the time this posts, this answer will be well past-due. Oh well.
I really gotta get back to my regular life here: my little daughter has taken this opportunity to completely raid the licorice box.
bebu