Premortality seems obvious

Everything in our mundane day to day lives is ruled by ethics, obligations, a desire for progress, for something better. Why is that? I don't see how any of these things can be necessary or self evident in any way without being connected to a pre and post mortality experience. I don't how anything but the reality of God can account for these things. This quote, posted originally on my Blogspot, summarizes my feelings entirely:

“All that can be said is that everything in our life happens as though we entered upon it with a load of obligations contracted in a previous existence. There is no reason arising from the conditions of our life on this earth for us to consider ourselves obliged to do good, to be tactful, even to be polite. … All these obligations whose sanction is not of this present life, seem to belong to a different world, founded on kindness, scruples, sacrifices, a world entirely different from this one, a world whence we emerge to be born on this earth, before returning thither, perhaps to live under the empire of those unknown laws we have obeyed because we bore their teaching within us without knowing who had taught us.” (Marcel Proust, La Prisonniere, as quoted in Homo Viator by Gabriel Marcel.)