The reason is the indefiniteness of the Minkowski metric. In accordance with this, anything definite has to eventually pass back into indefiniteness. Right knowledge must be free from three main defects&colon; doubt, delusion, and indefiniteness. Indefiniteness in plural nouns is expressed by the bare noun without an article. The indefiniteness is spatial in early usages as in Homer (indefinite sea). This means that indefiniteness is implied by the lack of definite article or determiner.