Once we commit a negative action, unless it is purified we will experience its consequences. We can’t shrink the responsibility or try to make the karma disappear by justifying it. It doesn’t work that way. Whoever commits an act will infallibly experience its results, whether positive or negative. Every movement of our thought, words, and deeds is like a stitch in the fabric of our coming reality. Latent in our present experience are oceans of karma from countless past lifetimes, which under the proper conditions will come to fruition. In order to find liberation from samsara, we must work at the causal level, not the level of results, the pleasure and pain that are the consequences of our behavior. To do so, we need to purify our earlier mistakes and change the mind that plants the seeds of suffering, purify the mental poisons that perpetuate endless karma.
~Chagdud Tulku Rinpoche