Answers To Objections
(1) It may be said that if it is inherent in judgement to essentially disclose reality lying beyond knowledge, then all judgements must be true, which is not the case. To solve this difficulty al-Sadr explains the meaning of 'essential disclosure'. It is inherent in judgement to point towards a reality independent of itself. Whether true or false, it discloses judgement is not detached other than itself. Thus essential disclosure of from judgement itself, even when there is error and ambiguity (the author uses the word 'knowledge' instead of judgement in this statement, which does not agree with the conception that knowledge is something always true).
(2) The second objection is that if judgement may be erroneous, its property of essential disclosure being unable to protect it from error, how can we rely upon it? The answer is that if human thought did not possess a number of judgements of indubitable certainty, no judgement would be free of doubt and it would be impossible for us to know any reality. It is here that the doctrine of necessary primary knowledge comes to our rescue. This doctrine asserts that there is a knowledge whose truth is secure and which is completely free from error. Error occurs in inferring secondary judgements on the basis of primary knowledge. Even Berkeley unconsciously believes in a store of certain knowledge, for no one can demonstrate anything unless he bases his demonstration on the fundamentals contained in primary knowledge such as the law of contradiction and the principle of causality and necessity.
This discussion of philosophical idealism enables us to draw two conclusions: (1) the acceptance of the essentially disclosing nature of judgements, (2) the acceptance of basic principle of human knowledge whose truth is necessarily secure. Even Berkeley's belief in the existence of other minds and his proofs in favour of idealism assume the acceptance of these two notions.
Realism (which in metaphysics means that reality is not reducible to mind and thought, and in epistemology means the doctrine that objects of knowledge and experience exist independently of their being known or experienced) bases its arguments on these two principles.