Emptiness is the unmentionable truth. It is the ultimate ground of reality, the foundation from which all appearances arise, and the source from which all phenomena manifest. But emptiness itself is not a thing. It is not a phenomenon, it is not something that can be conceived and defined by the conceptual mind, and it is not something that can be expressed with language. By nature of being the ultimate, fundamental truth, it is confined to the background of reality. It is the fabric from which reality is woven and so can never be pointed out as a “thing”, or a part, within reality. Thus, emptiness must forever remain implicit, unconceived, and inexpressible. It may pervade every corner of our world but it is the Unmentionable, the one thing that is distorted and corrupted by the mere act of attempting to articulate it.
The problem is that if we want to fully realize this “ultimate nature of reality,” we first need to identify it, which requires conceiving, naming, and defining emptiness. However, it is important to keep in mind that this process of describing emptiness is merely a teaching device. Its sole purpose is to illustrate emptiness for the novice student so that he or she will eventually realize its unmentionable nature. The practice of presenting emptiness as an distinct phenomenon—a “thing” that can be known, named, and particularized—should not be assumed to mean that emptiness exists as a discrete entity in contradistinction to other phenomena. Explaining the idea of God to a child by saying that God is an old man who lives in the sky does not mean that God actually exists in that way; it is just a useful way of presenting a profound concept to a simple mind.
Once we identify emptiness, however, we need to proceed to reconcile this phenomenon with all the other conventional things that occupy our lives. This practice, known as unifying the two truths, depends on learning how emptiness and other phenomena can mutually exist without exaggerating one and denying the relative validity of the other. In other words, once we have conceived emptiness and brought it into our world as a unique entity we have to find its proper place in relation to all the other things in our world.
For most students of emptiness it might seem that the proper place for emptiness is front and center, at the forefront of our consciousness and at the center of our attention. This is understandable considering the strong emphasis that Buddhist teachers and texts place on emptiness. Also, a genuine realization of emptiness can require many years of dedicated study and meditation and such concentrated effort would only be possible if emptiness were kept “front and center” in the student’s awareness throughout his training. However, when emptiness is granted status as an individual phenomenon in relation to other phenomena, we exaggerate the proper place of emptiness and fail to understand the union of the two truths. The mere identification of emptiness within a context of conventional phenomena implies something that it is not: a phenomenon with conventional characteristics that can be conceived, defined, and named in relationship to other phenomena. Rather than being a conventional thing like everything else, emptiness is like the space between conventional things: present only in an implicit, negative way.
The proper place for emptiness is the background of reality. As the ultimate truth and true nature of all phenomena, it necessarily remains behind the scenes, providing the existential basis for all things but forever hidden from view. It cannot even be said to exist for we cannot ascribe any qualities to it without evoking it into the domain of conventional truths. All our attempts to know it and describe it only succeed in creating a conventional truth called “emptiness.” The ultimate truth that we seek refuses to be known or named; it is unmentionable.
Before we encounter teachings on emptiness, emptiness is an unknown phenomenon. Although it may be the ultimate truth of all phenomena, we have no knowledge of it. Then, by studying the teachings on emptiness, we learn to identify it. We mentally carve it out of our reality by conceiving it, defining it, and understanding it in relation to other phenomena: “It is the mere lack of inherent existence. It’s like empty space but it’s not nothingness. It’s permanent. It’s a negative phenomenon. Etc.” In this way, emptiness becomes a known phenomenon. Eventually, with diligent study and meditation, emptiness becomes so familiar to us that it is as real and tangible as conventional truths. At this point, our understanding of emptiness as an individual phenomenon—a thing—is complete. The reality of emptiness has been incontrovertibly established in our mind. Our study and meditation has succeeded in convincing us of the undeniable reality of emptiness and, once this point is reached, no amount of study or analysis will make emptiness any more true, substantial, or factual. This may appear to be the end of one’s training in emptiness but, actually, this stage, at which one’s understanding of emptiness itself becomes more or less complete, represents a turning point and a halfway mark on the path to realizing our true goal: the union of the two truths.
The reason that a complete understanding of emptiness itself does not mark our final destination is that it leads to a sort of ontological crisis between emptiness and conventional truths which must be resolved if we hope to extract the meaning of emptiness from our private meditation and incorporate it into our life in the world. The basic problem is that once emptiness is established in our mind as a real and true phenomenon, it appears that emptiness and conventional truths are incompatible. As we develop a sense of the equal realness of emptiness and conventional truths, it seems that we are forced to choose between them. This dilemma is the principal challenge for the practice of unifying the two truths and, again, the practice of unifying the two truths primarily depends on understanding their relationship—finding their respective places in our experience of reality.
When considering the proper place for emptiness we may be inclined to grant emptiness precedence over conventional truths, or perhaps try to maintain both on the same level—equal opponents locked in constant tension. However, these uninspired attempts at a “union” of the two truths fail to appreciate the purpose and significance of presenting emptiness as a thing with its own characteristics. Emptiness is depicted as a “phenomenon” in order to help us draw it out of (non)existence and then use as a contrast to conventional truths so that we can, through a process of comparison and reconciliation, gradually develop an understanding of the true nature of conventional truths. Emptiness is described as if it were a thing, but it’s not. The thing-ness of emptiness is an artificial fabrication that is designed to induce the above “ontological crisis” in the mind of the student so that he will be forced to question and examine his beliefs about the nature of conventional phenomena. The creation of emptiness-as-a-phenomenon leads to the unavoidable confrontation of emptiness vs. conventional truths, which can only be resolved by investigating and discovering the true nature of things. Thus, the concept of emptiness as a phenomenon is a philosophical prop—a pragmatic tool that is used to lead the student’s mind into a philosophical quandary. In this case, that quandary is the question of the nature of existence.
Emptiness is not actually a thing in the way that conventional truths are things because emptiness is merely the mode of existence of things, not a thing itself. It is an answer to the question of how things exist not an answer to the question of what exists. We could say that emptiness is a false phenomenon. The teachings on emptiness describe it as if it were a phenomenon but we must keep in mind that this description is merely provided for the benefit of our limited understanding; it is not intended to be a definitive statement about the nature of emptiness.
If we remember that emptiness is a false phenomenon while attempting to unify the two truths, it will be easier to reach a resolution. Or rather, we will be able to recognize that in fact there is no conflict, no incompatibility, that needs to be resolved. Since emptiness is not a thing, it contains no qualities or characteristics that could clash with conventional truths. “In emptiness there is no form, no feeling, no discrimination, no compositional factors, no consciousness. There is no eye, no ear, no nose, no tongue, no body, no mentality; no form, no sound, no smell, no taste, no tactile object, no phenomenon…” When viewed in comparison to conventional truths, emptiness has no distinguishing features and indeed has no appearance at all. It would appear that emptiness does not even exist! It is this nonappearance or nonexistence of emptiness that marks the union of the two truths for only when emptiness fades invisibly into the background of reality do we cease to experience a conflict between ultimate truth and conventional truths. Thus, the proper place for emptiness is nowhere (or everywhere?!)—a place where it is not seen, heard, or felt, a place where it remains permanently non-localized, a place where it can suffuse and permeate all phenomena without being limited to any one phenomenon, a place where it remains forever hidden unless we decide to draw it out of reality. We could say that emptiness is the formless, existential context of conventional truths. It does not really consist of anything; it is a name without a reference.
The objective of the practice of the union of the two truths is to allow emptiness to return to its proper place by learning how to let it become more and more invisible, without denying its reality. At the beginning of our study, our efforts are focused on drawing emptiness out of the unknown: conceptualizing emptiness, making it an explicitly known phenomenon that has a certain definition and meaning, and treating it like a thing. But once this has been accomplished and emptiness is established in our mind as a real entity, we then need to learn how emptiness naturally exists without being sculpted or molded into existence in any form, even thought-forms. We need to allow emptiness to recede back into the unknown from which we created it while somehow maintaining an understanding of its significance. We need to reach a state in which the meaning of emptiness has been so thoroughly internalized, so deeply imbedded into our mind, that it appears as if emptiness does not exist at all. As Chandrakirti says, we need to “see emptiness by not seeing it.”
As you might imagine, this practice of becoming so familiar with emptiness that it appears to fade away requires great spiritual integrity. The practitioner who is learning to unify the two truths must be willing to patiently abide within the tension between the two truths until his mind has surrendered the desire to escape from that tension by grasping at the extremes of existence or nonexistence. Furthermore, he must mold his faith, discipline, and other virtues to the specific needs of his task. For instance, he must develop faith in an unseen and unknown emptiness. In the beginning of his study, the practitioner’s faith in emptiness is predominantly based on reasoning and conceptual understanding; he only believes in the emptiness to the extent that he can logically prove that it exists. However, with a direct realization of emptiness followed by the practice of unifying the two truths, the practitioner must learn to relinquish his reliance on the conceptual forms of emptiness and develop faith in a formless, nonconceptual version of emptiness. He must also cultivate a commensurate form of mental discipline which resists the compulsive tendency to express emptiness in conceptual form. He must learn to accept that emptiness “just is” without yielding to the conceptual mind’s demand to know precisely what emptiness is. He must accept that emptiness is inexpressible, indefinable, and unknowable and resist the temptation to express it, define it, and know it. He must learn to be satisfied with the unmentionable nature of emptiness.