By way of meditation, let the mind rest first, since all realizations and positive feelings are attained when the mind is in a state of equanimity. We cannot experience realization of any depth if we are preoccupied with thoughts. Although renunciation and bodhicitta can be maintained and cultivated by contemplation, realization of emptiness can only be experienced when the mind is calm.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

The Buddha once said that among his teachings on various topics, many do not reveal the complete meaning because they are directed at educating people of certain mental dispositions. However, there is one teaching which is definitive and invariable, a core concept repeated time and time again by the buddhas not only of the present but also the past and future– that of emptiness. Emptiness is ultimate truth. It is the essence of Buddhist doctrine, the underlying substance of the teachings of Buddha Sakyamuni as well as the buddhas and bodhisattvas of the ten directions and three times.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

Some people will ask: if all things do not exist, why are we able to perceive them? This is because we perceive them incorrectly. Why is that? Our eye consciousness is also tainted by ignorance and is therefore subject to error.

This point can easily be established. For instance, apart from motion which is readily apparent in a fire, river current, etc., our eyes see all things as basically motionless. Actually, all matter is composed of very small particles. These particles are in a constant state of flux, arising and ceasing each instant, even if measured in only one millionth of a second. There is nothing that stands still in this world. As such, why do we not see it? This illustrates the problem we have with our eyes. They are obstructed by ignorance and thus cannot see the true face of matter. If they cannot perceive the truth at this level, the more profound nature of reality is even harder to discern.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

Even if our eyes can see, our ears can hear, there is nothing special about that since neither the eye nor the ear can apprehend the true nature of reality. Sound waves also change moment to moment. For instance, when we hear the two words “yan jing (eyes)” pronounced, we do not hear the arising and ceasing that take place within the sound, however hard we may try. We hear a continuous sound “yan_ _ _ jing_ _ _ ” but, in fact, what we hear is not one continuous sound, just instants of sound connected together.

Consider another example. If we light up a candle and make a circle in the dark with the candle, we will see a bright circle of fire. Actually, there is no circle to speak of. A circle does not exist at all. Because our eyes cannot capture each instant and step as the candle moves, we mistake all of these instants for one motion that is concurrent, continuous, and indivisible.

Similarly, when the two words “sheng yin (sound)” are pronounced, they too can be separated into many instants, each one thousandth of a second or one ten-thousandth of a second. These two words are not one continuous sound, but instants of sound that are pronounced in sequence. However, our ears are not able to make the distinction.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

Why is emptiness the essence of Buddhadharma? Because all buddhas and bodhisattvas have but one goal in mind, that is, to help sentient beings attain liberation. How can this be achieved? We cannot resolve the question of birth, aging, illness, and death, or obtain liberation by way of clairvoyant powers, etc. There is only one root cause of cyclic existence and only one method that can eliminate it. The root cause of cyclic existence is ignorance. All afflictions such as greed, anger, and delusion stem from ignorance or from self- attachment which arises from ignorance.

How do we overcome ignorance? Only wisdom can cut through ignorance, since wisdom and ignorance directly oppose or contradict one another. There is no such contradiction between ignorance and other methods like generosity, moral conduct, patience, and meditative absorption.

The wisdom herein refers not to worldly knowledge; it is the unsurpassed wisdom propagated by Buddha Sakyamuni, the realization of emptiness of self in person and in phenomena. The essence of the teachings of the buddhas and bodhisattvas of the ten directions and three times is none other than the wisdom that realizes emptiness.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

What about a person who on hearing the teachings of emptiness and no-self has no reaction at all and appears dull, displaying neither confidence nor repugnance? On this point, the great master Tsongkhapa said in his commentary on Introduction to the Middle Way that without clairvoyant power, a teacher cannot ascertain a person’s capacity nor know the extent to which the teachings on emptiness can be expounded. Nonetheless, a person who has genuine respect for a spiritual friend or guru and adheres strictly to the guru’s every word is also qualified to receive the teachings on emptiness, even if the person does not exhibit the kind of reactions mentioned above.

Why is that? Although the wisdom capacity of this type of person is not yet mature, they have deep faith in their spiritual friend; they accept whatever the spiritual friend says and whatever is taught by the buddhas and bodhisattvas. In their minds, there cannot possibly be any mistake in the teachings of the guru and that of the buddhas and bodhisattvas; even if they do not understand emptiness at the moment, they can accept the concept. Hence, it is also fine to teach emptiness to this kind of person.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

Also, a lot of people know that cosmic radiation, an electromagnetic radiation brought on by energy particles in the sky, is something very subtle which the eye cannot perceive. It penetrates our body all the time, including our heart and brain, yet we do not feel it at all. Although we do not feel it, it nonetheless exists. Hence, our sense of touch, that is, our tactile consciousness also cannot be relied on.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

Nonetheless, the sutras also say we should all listen to the teachings on emptiness whether we have faith in it or not. Why is that? Even if a person rejects the teachings and declines into hell, it is but one rebirth in hell. Having listened to the teachings on emptiness, the person has planted the seeds of emptiness which will ripen in the not too distant future. Hence, after leaving the hell realm, the person’s journey in samsara will come to an end at some point just on account of this seed of virtue. Without hearing the teachings, there can be no end to the cycle of rebirth, no opportunity for liberation. Hence, Bodhisattva Manjusri believed this type of person should also listen to the teachings on emptiness.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"

The Buddha recognized this problem and specified that teachings on emptiness be given only to a selective audience. To receive the teachings, one must have the right disposition. There are rules on who can listen to the teachings and who cannot.

In Introduction to the Middle Way, it is said everyone is endowed with two kinds of root virtue or capacity: one is the wisdom of emptiness, the other the accumulation of merit – also known as the roots of wisdom and skillful means. One can receive the teachings on emptiness only when his or her wisdom capacity is mature.

What are the perceptible signs of mature wisdom root in a person? If upon hearing the teachings of emptiness, a person exudes great confidence with tears running down the face and the hair on the body standing up – these are signs of mature root of wisdom. A person of this capacity will quickly realize emptiness when he or she receives the teachings. So it is necessary to give the teaching in this case.

- Quote from The Four Seals of Dhama, "All Phenomena Lack Self-Existence"