The Four Noble Truths of the Theravada tradition is a part of this wisdom. And complete renunciation entails mastery of the Four Noble Truths.

Some people do not see the point of preparing for future lives because they are not feeling any obvious distress right now. Yet worrying about the well-being in their old age, they will do all they can to make money even without concerns for karma and retributions sometimes. This is very foolish. It has never occurred to them that they have already been born human and that no matter how hard this life is, it is nowhere close to the severe suffering born by those in the three lower realms. Where will we be reborn next time? Will we have another human birth like this one? No one knows. So, to be well prepared for the next life should be the rational thing to do. What does it take to be well prepared? It certainly is not wealth or fame we need but spiritual practice.

- Quote from The Right View, "The Three Supreme Methods"

Mind “free of clinging and concepts” means emptiness, the void nature of all phenomena. Most of you may not have realized emptiness, but there is no need to be anxious. Once you have generated renunciation and bodhicitta, realization of emptiness can be rather easy to accomplish after all. Conversely, trying to realize emptiness without cultivating renunciation and bodhicitta first will be like making rice out of sand.

To use another analogy, it will be easier to harvest when seeds are sown in springtime. Whereas in wintertime, due to a lack of the requisite conditions, seeds sown in this season may not yield any crop no matter how much effort has been made. That is to say, when all the necessary conditions are in place and ripe for happening, things will naturally take their courses as wished.

The standard set in the texts regarding actual practice, say, the practice of the six paramitas, is to do it while realizing at all times the empty nature of all phenomena. For example, when releasing life of other beings, one should realize that the person who releases (oneself), the beings released and the act of releasing are all without self-nature and hence illusory like dreams. That is, the action performed is free of the concept of a doer, an object and an action. This constitutes the second of the Three Supreme Methods.

The Noble Truth of Suffering encompasses the non-sentient world of land, rivers, mountains and so forth, as well as the sentient world of all living beings in the six realms. In other words, all sentient beings and what their six consciousnesses (eye, ear, nose, tongue, body and mind) come in contact with are all included in the domain of the Noble Truth of Suffering. Because we are in constant contact with both the sentient and the non-sentient world, suffering manifests around us all the time. We ourselves are also part of it. Even so, people have hardly known correctly the nature of suffering, which in turn leads to much distress. It is therefore so important to understand it well.

- Quote from The Right View, "The Four Noble Truths—the Path Out of Samsara"

There are some who have never stolen things, killed or hurt anyone; rather, they have kept their vows and practiced virtue. Yet, they often seem to be less fortunate than others in many aspects. Such cases tend to make people wonder, “If karma was true, why should good people run into bad luck?” Lay practitioners who do not have in-depth knowledge of karma or fully understand the viewpoints of Abhidharma-kosha-shastra may ask the same question. Some would even say, “I have attended many pujas and read so many scriptures. I should not have to suffer this or that illness or misfortune.” This is a wrong view. The fact is that all the virtuous actions committed have been stored in our alaya consciousness. It is due to the relevant conditions not yet matured that karma derived from those actions has not come to fruition. This is like a farmer who sowed all his grains in the springtime and must wait five to six months for the harvest. In the meantime, he is just a poor fellow with nothing left to eat at home. Some people may question, “You have toiled hard every day, tilling the land. Why don’t you have any food to eat?” Question like this is pointless. Everyone knows that there is a waiting period between sowing and harvesting.The reason why he has no food now is because he did not plough the land properly last year to reap a bumper harvest this year. His hard working this year would not have directly affected that outcome in any way. Similarly, attending pujas or liberating animals would not have any direct impact on the pain and misfortune we suffer now as those are the manifestations of the ripening of past negative karma.

We should not think of burning incense and doing prostration as being mundane, whereas listening to the teachings of Madhyamaka or the Great Perfection is supramundane. The distinction between the two is simply not about form.

Take the example of offering butter lamp to the Three Jewels. Given the same object of offering, act of offering and person who offers, the practice will be deemed mundane when renunciation is not generated and the purpose of the offering is to obtain worldly benefits like health, longevity, job promotion, wealth and so on, or a favorable rebirth. Conversely, offering lamp out of true renunciation and to seek liberation from samsara will be considered a supramundane practice. Therefore, the gauge for distinguishing the mundane from the supramundane is no other than whether one has renounced worldly pursuits or not.

When we come upon suffering, we should face it courageously rather than passively resist it. Once this hurdle is overcome, we can calmly accept a similar kind of suffering the next time and defeat it. In this way, we become the victor. If we persist, we can increase our mental strength and defeat all suffering.

- Quote from Are You Ready For Happiness? Don't Let the Paper Tiger Scare You Off, "How to Face Suffering"

With bodhicitta, many problems related to practice could be easily solved since bodhicitta has within itself the incredible capacity for accumulating merit, forgiving and purifying evil karma and so forth. Thus, bodhicitta is regarded as the indispensable universal key for the entrance of Mahayana Buddhism.

We should know all suffering comes from attachment to self-love. Because of this attachment, we create negative karma for self-interest and suffer painful retributions. When we come upon suffering, we do not understand it is of our own doing; we place the blame on others and develop hatred; with hatred, more bad karma is created. The result of this perpetual cycle of enmity is that we cannot extricate ourselves from samsara. If we want to be free of suffering, we must change our ways. From now on, we should help, love, and support all sentient beings with no ego attached.

- Quote from Are You Ready For Happiness? Don't Let the Paper Tiger Scare You Off, "How to Face Suffering"