a practical approach:
earth is a complex world. it didn't always exist, i think that can be agreed upon. it may not always exist in the future. it is a belief, however, that the soul is eternal, that is, ever present in all time. how a soul can be placed upon earth, by forces beyond our control, is another question. in this view, we all come from other worlds to earth. and what happens when we leave? there seem only two possibilities, that we return from where we came, or that we pass on to yet another world, assuming that we are not fated to live again and again on earth, and that we never truly die.
earth can seem an alien place, always a sense present that this is not truly home and that it is only for a while. because life is complicated and we are required to make many decisions, some of which go wrong, it can be a cruel, hard experience. it would seem some people are driven by their ambition, they know what they want, but i am rather more sure of what i don't want, what i want to make sure does not happen to me. you could say i am more driven by fear not by want.
in every poor decision, there is often the failure to consider all the possibilities that could happen. we naturally make optimistic assumptions at first, but we need to be more aware of risk and the likelihood that such assumptions simply do not hold, that what we have thought about for much time does not happen at all. too often, i have assumed the best outcome and subsequently been sorely disappointed. ask yourself, first, what if it's not true and second, have i considered all the possibilities? what do i need to do? what do i need to not do?
unfortunately, regret is something we all suffer. we all make mistakes. to my mind, a life without error is impossible. however, we do become more intelligent about risk as we grow older, and a future of fewer lesser mistakes and without serious accident is something to strive for.