At the same time it is practically treated as a quality because it always has the substance tejas for its substrate, and depends on it. This must not be objected to on the ground that what is called light is really nothing but dissolving particles of matter which proceed from the substance tejas; for if this were so, shining gems and the sun would in the end consume themselves completely. Moreover, if the flame of a lamp consisted of dissolving particles of matter, it would never be apprehended as a whole; for no reason can be stated why those particles should regularly rise in an agglomerated form to the height of four fingers breadth, and after that simultaneously disperse themselves uniformly in all directions--upwards, sideways, and downwards. The fact is that the flame of the lamp together with its light is produced anew every moment and again vanishes every moment; as we may infer from the successive combination of sufficient causes (viz. particles of oil and wick) and from its coming to an end when those causes are completely consumed. Analogously to the lamp, the Self is essentially intelligent (kid-rûpa), and has intelligence (kaitanya) for its quality. And to be essentially intelligent means to be self-luminous. There are many scriptural texts declaring this, compare e.g. 'As a mass of salt has neither inside nor outside but is altogether a mass of taste, thus indeed that Self has neither inside nor outside but is altogether a mass of knowledge' (Bri. Up. IV, 5, 13); 'There that person becomes self-luminous, there is no destruction of the knowing of the knower' (Bri. Up. IV, 3, 14; 30); 'He who knows, let me smell this, he is the Self (Ch. Up. VIII, 12, 4); 'Who is that Self? That one who is made of knowledge, among the prânas, within the heart, the light, the person' (Bri. Up. IV, 3, 7); 'For it is he who sees, hears, smells, tastes, thinks, considers, acts, the person whose Self is knowledge' (Pr. Up. IV, 9); 'Whereby should one know the knower' (Bri. Up. IV, 5, 15). 'This person knows,' 'The seer does not see death nor illness nor pain' (Ch. Up. VII, 26, 2); 'That highest person not remembering this body into which he was born' (Ch. Up. VIII, 12, 3); 'Thus these sixteen parts of the spectator that go towards the person; when they have readied the person, sink into him' (Pr. Up. VI, 5); 'From this consisting of mind, there is different an interior Self consisting of knowledge' (Taitt. Up. II, 4). And the Sûtrakâra also will refer to the Self as a 'knower' in II, 3, 18. All which shows that the self-luminous Self is a knower, i.e. a knowing subject, and not pure light (non-personal intelligence). In general we may say that where there is light it must belong to something, as shown by the light of a lamp. The Self thus cannot be mere consciousness. The grammarians moreover tell us that words such as 'consciousness,' 'knowledge,' &c., are relative; neither ordinary nor Vedic language uses expressions such