The whole universe is said to have the constituency of ‘three thousands,’ but the theory is quite different from other pluralistic systems. It is not an enumeration of all dharmas; nor is it the world system of three Chiliocosms. What is it then? We must explain these ‘three thousands.’ The expression ‘three thousands’ does not indicate a numerical or substantial immensity, but is intended to show the inter-permeation of all dharmas and the ultimate unity of the whole universe.

As the basis of ‘three thousands’ the Tendai school sets forth a world system of ten realms. That is to say, the world of living beings is divided into ten realms, of which the higher four are saintly and the lower six ordinary.

1. The realm of Buddhas. A Buddha is not inside the circle of ten, but as he advents among men to preach his doctrine he is now partially included in it.
2. A bodhisattva: a would-be-Buddha.
3. Pratyeka-buddha: a Buddha for himself, not teaching others.
4. Sravaka: a direct disciple of the Buddha. The above four are classed as the saintly stages.
5. Heavenly Beings: superhuman as they are, they cannot get perfectly enlightened without the teaching of the Buddha.
6. Asura: fighting spirits. Though partially heavenly, they are placed in the lower half of the realm.
7. Men: neutral in nature.
8. Preta: departed beings, otherwise called ‘hungry spirits.’
9. Beasts: innocent in nature, including the whole animal kingdom.
10. Depraved men: ‘hellish beings’ who are in the lowest stage.

These ten realms are mutually immanent and mutually inclusive, each one having in it the remaining nine realms. For example, the realm of men will include the other nine from Buddha to Hell, and so will any of the ten realms. Even the realm of Buddhas includes the nature of hell and all the rest, because a Buddha, though not hellish himself, intends to save the depraved or hellish beings, and therefore also has hell in his mind. In this sense, the realm of the Buddhas, too, includes the other nine realms.

This immanence of each of the ten worlds in all of them accounts for 100 worlds. Further, each of these realms has ten different features as we have seen above, i.e., form, nature, substance, force, action, cause, circumstance, effect, remuneration and the ultimate state. These are the ten features of Thusness. By discovering these ten features in the 100 worlds, this school arrives at the doctrine of 1,000 realms.

Moreover, each realm consists of three divisions: the species of living beings, the species of space-region or vessel to live in and the species of five aggregates (skandhas) taken separately from living beings—form (matter), perception, conception (idea), volition (will) and consciousness. Thus there are three thousand realms, constituting the whole of manifested reality.

In Buddhism, ‘three thousands’ usually refers to the great Chiliocosm consisting of 1,000 small, 1,000 middle, and 1,000 large worlds. With the Tendai School, however, it is not such a world system, but is the universe of all beings and things, i.e., the whole world of dynamic becoming.

The ultimate truth taught n the Tendai School is Thusness (Tathata), not thisness (tattva). Thusness means the true state of things in themselves, the phenomenal world being the state of things manifested before us. The true state of things cannot be seen directly or immediately. We must see it in the phenomena which are ever changing and becoming. Thus the true state is dynamic. The phenomena themselves are identical with the true state of things. The true state of things is Thusness, i.e., things as they are manifested, just as moving waves are not different from the still water. We generally contrast the still water with the moving waves, but moving or staying they are only the manifestation of one and the same water. What is being manifested or shown outwardly is nothing but the thing itself. There is no difference between the two.

This is the theory of the true state of all dharmas; that is, all elements manifested are the elements in their own state (sarva-dharma-svalaksana-ta). Or. to use another expression, the ‘worldly state (phenomenal) is permanent’ (lokalaksana-nityata).

According to the Tendai doctrine any dharma expresses itself in all three truths. All existences are thus mutually penetrating in all three truths.

One should not think, as is ordinarily done, that there exists an abiding motionless substance at the center, around which its qualities exist, moving and changing. If you suppose noumenon to be such an abiding substance, you will be misled altogether. Even the Mahayanistic people who maintain the doctrine of two truths—the worldly or popular truth and the higher truth—are often mistaken by a dichotomic idea of argument. The Tendai School, therefore, sets forth the threefold truth; i.e., the truth of void, the truth of temporariness and the truth of mean. All things have no reality and, therefore, are void. But they have temporary existence. They are at the same time mean or middle, that is, true state, Thusness.

According to the school the three truths are three in one, one in three. The principle is one but the method of explanation is threefold. Each one of the three has the value of all. Therefore, when our argument is based on the void, we deny the existence of both the temporary and the middle, since we consider the void as transcending all. Thus, the three will all be void. The same will be the case when we argue by means of the temporary truth or the middle truth. Therefore, when one is void, all will be void; when one is temporary, all will be temporary; when one is middle, all will be middle. They are otherwise called the identical void, identical temporary and identical middle. It is also said to be the perfectly harmonious triple truth or the absolute triple truth.

We should not consider the three truths as separate because the three penetrate one another and are found perfectly harnlonized and united together. A thing is void but is also temporarily existent. It is temporary because it is void, and the fact that everything is void and at the same time tetnporary is the middle truth,

Buddhism assumes no substance, no abiding individual self, no soul, no Creator, no root principle of the universe. But this by no means implies that all beings and things do not exist. They do not exist with a substratum or a permanent essence in them, as people often think, but they do exist as causal relatives or combinations. All becoming, either personal or universal, originate from the principle of causation, and exist in causal combinations. The center of causation is one’s own action, and the action will leave its latent energy which decides the ensuing existence. Accordingly, our past forms our present, and the present forms the future. This is the theory of self-creation.

We are, therefore, always creating and always changing. Men are ever floating on the waves of dynamic becoming called ‘samsara,’ the stream of life. Creating and changing ourselves as a whole, we go on. There should no fear of the loss of identity, for our present self as a whole is an effect of the cause which we may call our past self; similarity in the future it is impossible that our self will be lost since we are necessarily self-creating beings. It is unreasonable to seek an unchanging essence in an all-changing being.

The seed-elements are assumed to be four—Earth (hardness), Water (wetness), Fire (warmth) and Air (motion)—and all matters or forms are one or another combination of these four.

The formation of a personality and of the universe is similar, both consisting of matter and mind, the difference being that in a personality, mind is prevalent while in the universe matter is prevalent. Personality consists of five groups (skandha)–Form (body), Perception, Conception, Volition and Consciousness (mind). The Form or body, again, consists of earth, water, fire and air. Man is therefore to be considered as one who has a form, perceives, conceives, wills and thinks. These are his actions (karma) which altogether form his personal existence, which has no other reality. A man is a temporary entity, and is only living in the contiguity of momentariness. In order to change his personality for better, the cultivation of his knowledge and wisdom is necessary, because the perfection of wisdom is the perfection of personality—Enlightenment.