Each person’s karmic background is really, really complex. You just trust that putting in good actions, putting in skillful actions, is going to help.
"The Buddha once said that the results of action are an imponderable, which may sound strange given that his teaching on action is so basic to all his other teachings. The main principle is simple: You do, or say, or think something with a skillful intention, and the results are going to be good; you do, or say, or think something with unskillful intentions, and the results are going to be bad. That’s simple — but the problem is that that simple principle gets iterated many, many, many times. And that makes its results complex. How many times in the course of the day have you done something, or said something, or thought something? You can’t count all the actions, and that’s just in one day. And it spreads out over lifetimes. You begin to realize that you’ve got a lot of things going on here. Some of the actions will give results quickly; others will give them slowly. Others are ready to give the results, but you’re not watering them, so they don’t give the results. ...