Beginners of Vajrayana need not and are, in fact, forbidden to accept the five meats and five nectars. There is an analogy in the Kalacakra Tantra: Some people can cure their illness and prolong life by taking a medicine called Nectar of Brahmā directly, while others are not allowed to drink it but can only carry the nectar in a gawu box around their neck because they will die if they drink the medicine. Similarly, some people may greatly benefit from undertaking the kind of tantric practices that accept the five meats and five nectars, but beginners who try to do the same will incur much harm with no progress to show for it. Therefore, these practices are off limits to them. If and when we reach a state of realization whereby we perceive all phenomena as a dream, with no attachment, we can then adopt the practices to speed up our progress.

Some may question if practitioners have eliminated all attachment, does it mean they are free to commit unwholesome deeds like killing, stealing, lying and sexual misconduct? Of course not. Vajrayana stresses that practitioners in their realized state do not have attachment to the discriminating notions such as sentient beings, killing lives, or good and evil, but other beings still harboring such attachment will be hurt by the unwholesome actions. So, a genuine practitioner can never behave this way, nor is it permitted in Vajrayana.

As stated in the sutras, “Existence in the human realm is rare, and all is impermanent.” Most of you here are already in your 30s and 40s. The remaining days, a few more decades at the most, are really not that long and will soon pass by before you know it. Unfortunately, there is no guarantee the opportunity to practice will present itself again in the next life if you fail to seize it this time. So the point is to lay the necessary foundation now as the stepping-stones leading to a better start for the next life.

Note that, in the Inner Tantra, the practices of ngöndro (outer and inner preliminaries), the specific main practice, the six paramitas, etc. are no different from the other categories of tantra or even that of sutra. However, some uncommon practices and conduct of the Inner Tantra are unique.

Take the example of afflictions such as greed, anger, jealousy, arrogance, etc. The Lesser Vehicle considers these negative emotions to be real; hence, in order to obliterate them, one must be armed with substantial opponent powers, or one may sustain real harm, which is a frightening prospect. The Great Vehicle, having understood more deeply the truth behind afflictions, does not think afflictions, the so-called five poisons or three poisons, have real property. But even so, in the illusory world, one still cannot face the truth directly but must rely on other external conditions such as bodhicitta to transform afflictions into the path. The Outer Tantra holds that afflictions are neither real nor fundamentally impure; instead, the five poisons can be transformed into the five wisdoms of the buddha, given certain conditions; without the right conditions, one is still afraid to confront afflictions directly. It is only in the Inner Tantra that the practitioner finally attains a profound state of realization.

Madhyamaka holds that all physical and mental phenomena are non-existent, empty and illusory like a dream. From the standpoint of absolute truth, all phenomena are without self, empty and luminous; but in relative truth, one should still be mindful of afflictions and exercise discretion in one’s conduct. The view of Madhyamaka is that afflictions can be transformed into the path of Dharma when bodhicitta and the view of emptiness are fully developed; otherwise, like the image of a snake, afflictions can still cause harm even if phenomena are immaterial and empty in nature.

Many people are convinced that what they practice must be of supra- mundane nature. How can it not be if they have been practicing the five extraordinary preliminaries? In fact, these five preliminaries are not only supramundane in nature but also part of the Mahayana practices. The key is, notwithstanding, having what kind of perspective when you sit down to practice these preliminaries. Though the possibility of practicing solely for the benefit of this life is slim, it is quite likely to undertake these practices to avoid rebirth in the hell realm. If the motivation is not to seek liberation for the sake of all sentient beings, the practice of the five preliminaries will be considered mundane, not supramundane. 

In terms of appearance, the wrathful deities look even more sinister than ordinary demons. People may easily mistake them for the deities of an evil cult if they do not know what the wrathful deities represent. For example, there is a blazing fire at the back of the wrathful deities and Dharma protectors, but white light at the back of the peaceful deities. Actually, fire here represents wisdom of the buddha—just like fire can burn down everything, so can wisdom cut through all afflictions. In addition, wrathful deities hold in their hands not bowls but human skulls, and the skulls contain not wholesome foods like fruit and grains but red blood. What does it mean? Blood represents desire, and desire is the main cause of ending up in the three lower realms. Drinking the blood represents eradicating completely the desire for samsara.

The teachings I have given so far all deal with renunciation and bodhicitta. Sure, I can also teach the Five Treatises or some advanced Vajrayana practices, but they will not be helpful to most of you here, at least not for the time being. It is like a cook should only make as much food as the guests can consume. To make more than the guests can stomach would be pointless. And this is the very reason why I hesitated to give advanced teachings all along.

If one could incorporate bodhicitta into one’s everyday activities, Mahayana practice would not seem so incompatible with the trivial and sometimes inconsequential affairs one has to deal with on a daily basis.

- Quote from The Right View, "The Three Differences"