It is stated in the scriptures that ripening of the cause comes in four types. The first is the one that ripens in the same lifetime. For example, karma was committed in youth and the effect takes place in middle or old age. Sometimes karma ripens even sooner, and the effect can be seen immediately. The reason is that certain conditions can expedite the manifestation of fruit. Such fast ripening has something to do with the object and the motivation of the action. There are many such cases told in One Hundred Stories about Karma (Karmasakata). For example, the Sangha and ordinary people are two completely different objects. If it is a serious case of stealing from or slandering the Sangha, the retribution may come right away or in this lifetime. If the same act is committed against ordinary people, one will surely bear the consequence but not necessarily right away or in this lifetime. The different results arise from the difference between the two objects. The other condition is the difference in motivation. If the intention to kill is very strong or has been premeditated for a long time, the retribution will come swiftly, whereas the effect may not be immediately apparent if the motivation to kill is not so fierce.

The second is the effect of committing great evil, such as the five hellish deeds, or great virtue will definitely materialize in the next life.The third effect is certain to manifest but the timing of which is uncertain; it may take three or four lifetimes or even longer. The fourth, there may or may not be any effect. What could be the reason for this uncertainty in view of infallible karma? When a weak cause (or karma) encounters a strong antidote, causality may then be broken.

The first three types of karma, that is, the one that ripens in this and next life, and with uncertain timing, are immutable karma. The fourth, with indefinite fruition, is mutable karma.

If everything were destined and immutable as some non-Buddhists believe, what would be the point of undertaking spiritual practice? Since everything has already been set, there is no point trying to change anything in life—if having a good life, rejoice in one’s good fortune; a miserable one, just bear it. By the same token, if everything were predetermined, it would be useless giving food to the needed since going hungry would have been their destiny anyway. Hence, fatalism has failed to stand.

A butcher who killed animals for a living had a change of heart and became a lay Buddhist. He expressed great repentance for the killings and vowed never to do it again. Once these two conditions are satisfied, karma derived from the killing will become mutable karma which may or may not result in any karmic fruit. If the repentance could go deeper, it would even be possible that the butcher might not need to bear any consequence at all.

When ink is poured on the snow, the snow will be turned into ink color. After it melts, the color can still be seen on the ground. Similarly, if karma is born of defilements, the karmic mark will be left in the alaya consciousness after defilements are gone. Karma (or cause) is kind of a unique ability. Although our eyes cannot see how rice seeds germinate, they do have within themselves the capacity to do so. Likewise, when a karmic seed is planted in the alaya consciousness, it will yield fruit when all the right conditions come together. This fruit is also called karmic effect. And this particular capacity of the alaya consciousness to yield karmic fruit is the inherent nature of cause.

Apparently, even non-Buddhist practitioners with some spiritual realization may still be confused about the workings of cause and effect, not to mention people without any right view or understanding. The complexity of the cycle of cause and effect and how it passes through the past, present and future make it possible only for the Buddha to comprehend entirely its causal relation. Others merely glimpse different parts of the cycle. These non-Buddhist practitioners are usually well learned; some may even have acquired certain clairvoyance over worldly matters. However, they jumped to a conclusion only based upon what they saw—virtuous people took rebirth in the lower realms—and from it the conclusion was drawn that cause and effect could not have existed. Then books were written and theories developed based on this conclusion, which gradually formed into a sect after attracting enough followers. This is how nihilistic view was established.

About those past misdeeds that we have performed but cannot recall, we can contemplate like this: “All the misdeeds that I have committed since beginningless time, intentionally or unintentionally, are all wrong. As if they are the poison I have taken, I feel the greatest fear and regret for my actions, and vow never to commit them ever again.” This way, all negative karma can be changed into mutable karma. The significance of such resolution cannot be overstated. Otherwise, any karmic effect will be possible if this is not done.

On the other hand, virtue also has the possibility to turn into mutable karma. It is therefore important for us to save all virtuous karma as best we can. There are two ways to do that. One is dedication. The other, a better way, is to understand fully the meaning of emptiness, that is, knowing virtuous karma is, like dreams, intrinsically illusory. If we can contemplate in this way, even if anger arises, it cannot destroy the root of virtue. Because anger is defilement, a mental affliction rooted in attachment, it is incompatible with the view that all phenomena are illusory. But the virtuous actions we performed are directly associated with attaining realization of that view. Since something mired in attachment is inferior to the virtuous root planted with wisdom, anger cannot destroy this root of virtue. If we have neither attained any realization nor dedicated merit, but are constantly filled with anger, virtuous karma will be destroyed very easily. For ordinary people, the best way to save accumulated good karma is dedication of merit.

Although we have not committed killing or stealing in this life and, being Buddhist practitioners, we often chant mantras, meditate and liberate animals, these virtuous actions are still the doings of defiled mortals. Once strong anger arises in our minds, all our virtuous karma so far accumulated will be destroyed instantly if the merit has not been dedicated. Besides, the roots of virtue of ordinary people are not stable— being good now does not mean staying good forever. If we were to have the powers of divination, we would be able to see all of our negative karma being stored in the alaya consciousness. Without repentance, the ensuing retributions will surely take place. Then it will exactly match the nihilists’ view, i.e., causality does not exist, such that one may lead a virtuous life but still drop to the lower realm after death. That would be a dangerous view for us Buddhists. Thus, we must repent all our negative karma as all of them can be purified through true penitence.

The Sarvastivada School and the Yogacara (Mind-Only) School hold many different viewpoints on the interpretation of causality, but the ones elucidated by the Mind-Only School are the more comprehensive within the context of the Relative Truth. The Yogacara School thinks that everyone has a mind continuum from beginningless time until the attainment of enlightenment. This mind continuum sometimes has the five consciousnesses of eyes, ears, nose, tongue and body, but sometimes not. No matter how it manifests itself, a permanent existence called the alaya consciousness is present at all times. Whenever karma is committed, a karmic seed will be planted in the alaya consciousness.