It appears that a thing or a phenomenon may be defined from the Buddhist point of view as being the combination of diverse characteristics [Footnote ref 258]. What we call a thing is but a conglomeration of diverse characteristics which are found to affect, determine or influence other conglomerations appearing as sentient or as inanimate bodies. So long as the characteristics forming the elements of any conglomeration remain perfectly the same, the conglomeration may be said to be the same. As soon as any of these characteristics is supplanted by any other new characteristic, the conglomeration is to be called a new one [Footnote ref 259]. Existence or being of things means the work that any conglomeration does or the influence that it exerts on other conglomerations. This in Sanskrit is called _arthakriyakaritva_ which literally translated means--the power of performing actions and purposes of some kind [Footnote ref 260]. The criterion of existence or being is the performance of certain specific actions, or rather existence means that a certain effect has been produced in some way (causal efficiency). That which has produced such an effect is then called existent or _sat_. Any change in the effect thus produced means a corresponding change of existence. Now, that selfsame definite specific effectwhich is produced now was never produced before, and cannot be repeated in the future, for that identical effect which is once produced cannot be produced again. So the effects produced in us by objects at different moments of time may be similar but cannot be identical. Each moment is associated with a new effect and each new effect thus produced means in each case the coming into being of a correspondingly new existence of things. If things were permanent there would be no reason why they should be performing different effects at different points of time. Any difference in the effect produced, whether due to the thing itself or its combination with other accessories, justifies us in asserting that the thing has changed and a new one has come in its place. The existence of a jug for example is known by the power it has of forcing itself upon our minds; if it had no such power then we could not have said that it existed. We can have no notion of the meaning of existence other than the impression produced on us; this impression is nothing else but the power exerted by things on us, for there is no reason why one should hold that beyond such powers as are associated with the production of impressions or effects there should be some other permanent entity to which the power adhered, and which existed even when the power was not exerted. We perceive the power of producing effects and define each unit of such power as amounting to a unit of existence. And as there would be different units of power at different moments, there should also be as many new existences, i.e. existents must be regarded as momentary, existing at each moment that exerts a new power. This definition of existence naturally brings in the doctrine of momentariness shown by Ratnakirtti.