We all have unskillful decisions, unskillful intentions that we’ve acted on in the past, but it doesn’t mean we have to suffer from them. They will have their effects but their effects are going to be mitigated or amplified by your present karma.

"When the Buddha explains issues of karma, he doesn’t use mechanical images. His images are all fluid. We all have unskillful decisions, unskillful intentions that we’ve acted on in the past, but it doesn’t mean we have to suffer from them. They will have their effects but their effects are going to be mitigated or amplified by your present karma. It’s as if we have two rivers coming together. If you’ve ever been at the spot where the Little Colorado joins the Colorado, you see two very different kinds of water. The Little Colorado is very muddy; the Colorado is clear. And right at the spot where they join it’s a mixture of the two. But as you go downstream, the muddiness disappears and the water is all clear. That’s because the Colorado is bigger than the Little Colorado; the muddiness is overcome by the clarity of the water the larger river.

This is what you want to do in your meditation. You want to make sure that your present karma is a bigger river of clear water. It’ll take care of the silt that comes in from the little river if you develop the skills that can keep your present intentions clear and in focus. So this is our opportunity right here as we meditate, to keep this river of present karma as clear and as large as possible."

~ Thanissaro Bhikkhu "The Rivers of Karma"