"Individual karmas are varied and of different kinds. Some karmas may not be modified. In this case, if we carry the karma for such a painful event to occur, it will occur. If, on the contrary, we do not have the karma for such a happy circumstance to manifest, it will not manifest. The prayer will hardly be able to modify things.

When we say that the law of karma is infallible, it means that a cause will necessarily produce its effect if nothing prevents it from happening. But if new elements come into play, a change is possible. Sincere devotion and prayer, as well as regret of past negative acts, are factors that can modify karma. There are profound means related to genuinely awakened beings or deities like Tara. That is why these means allow purification to change karma. Besides putting into work such factors, karma effectively produces its effects in an infallible way.

The seed of a weed will grow in an infallible way, unless we pull out the young sprout."

Bokar Rinpoche