Generally speaking, it is very difficult to directly prove the existence of causality because our eyes cannot look beyond this present life for causes from previous lives and the effects in future lives. Nonetheless, through indirect means it is possible to prove the link between cause and effect. Not only is samsara conditioned by causality, but also nirvana and liberation. Therefore, if it is liberation that we seek, we must plant the seed of liberation, which will then yield the fruit. Such is the view of Buddhism.

~ Luminous Wisdom 1: On Cause and Effect 

As far as what has been taught regarding the twelve links of dependent arising, the end of these twelve links is aging and death. After one cycle ends with aging and death, another cycle begins again with ignorance. Thus, we go round and round, cycling repeatedly through life and death.

～ Luminous Wisdom 3: The Buddhist Theory of the Origin of Species

Every sentient being is endowed with wisdom, but our wisdom is limited in depth and scope because we lack proper training of the mind. Zhi hui du refers specifically to the training of the mind, cultivating the wisdom that allows us to reach the unsurpassed state of attainment,  buddhahood. From an outsider’s point of view, the process appears to be mysterious and connected in some way with religion; a true practitioner, however, knows this training of the mind to be very real.

~ Luminous Wisdom 9 : The Significance of Buddhist Philosophy Today

For us ordinary people, it is very difficult to consider matters like renunciation, bodhicitta and liberation if we must struggle constantly to eke out a living. Harsh living conditions may be helpful for some to generate renunciation, but renunciation developed under such circumstances is not authentic, as genuine renunciation must include the aspiration to seek liberation. Poverty alone may not be enough reason for people to forsake samsara. It is only those who have grasped the essence of the Dharma who might possibly generate true renunciation. Therefore,  Buddhists in general need not and should not deliberately live too poorly.

~ Luminous Wisdom: 6

At the time that Bodhidharma came to China to give Dharma teachings, Emperor Wu of Liang asked him, “I did many good deeds, such as being vegetarian and reciting the name of the Buddha, just like a monk. How much merit have I earned?” Unexpectedly, Bodhidharma exclaimed, “No merit!” Why? Because all the good deeds that Emperor Wu of Liang did may had no connection to liberation, and were irrelevant to its attainment.

~ Luminous Wisdom 9: The Principles of Liberation

In the same way that physical illness needs the right medication to be cured, cyclic existence can only be stopped through practicing the Dharma. To effectively counteract defilements and attachment, one must exert a sharply opposing force. The exertion of this counteracting force is the path leading to the cessation of suffering.

In other words, the purpose of undertaking Dharma practice is bring the endless cycle of rebirth and death to a halt, not unlike what the right medicine does for a patient.

~ Luminous Wisdom 1: The Four Noble Truths

Depending on each of our own conditions and capacity, all of us should at least try to be vegetarian from now on.  Our motivation, though, should be different from that of the non-Buddhists, whose primary concerns are mostly health related rather than for their future lives or compassion for other sentient beings. We should not only stop eating meat but should also vow never to eat meat again. Absent the vow, simply stopping eating meat would not be considered a virtuous deed on its own. The vow should go like this: “By the merit of ceasing to eat meat now, may I never eat meat again in all my future lives.”

~ Luminous Wisdom : 1

Karma (or cause) has a kind of unique ability. Although our naked eyes cannot see how rice seeds will germinate, the seeds do have within themselves the capacity to do so.  Likewise, when a karmic seed is sown in the alaya consciousness, it will yield fruit when all the right conditions come together. This fruit is also called a karmic effect,  and this particular capacity of the alaya consciousness to yield karmic fruit is the inherent nature of the cause.

After a person has killed a being or stolen things, the karmic seed of such actions will remain in this person’s alaya consciousness. When it will germinate is uncertain, however. The scriptures often used the analogy of harvesting crops to illustrate the timing of karmic effects. There is a wide variety of grains and vegetables and the length of time for them to ripen varies. Some may ripen in only one to two months, and others five or six months, or even longer. The types of seeds, the geographical location, and the climate are all contributing factors to this disparity.    

~ Luminous Wisdom 1 ：On Cause and Effect

In the teachings of Guru Padmasambhava, he says that he would instruct different kinds of sentient beings by manifesting into different forms, lives, identities and appearances in Tibet, the Han areas, and even all over the world, in order to liberate them. In this degenerate time, humans are selfish and lack of faith. They hold numerous wrong views, and they are endangered by psychological crises and frequent natural disasters. At such a juncture, the blessings of Guru Padmasambhava will be even greater than those of other buddhas and bodhisattvas.

～ Luminous Wisdom 10 : The Guru Yoga Practice of The Seven Line Prayer