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.