It follows that through its constitution ideology is involved in the functioning of this social-imaginary relation, and is therefore necessarily fals… - Terry Eagleton

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It follows that through its constitution ideology is involved in the functioning of this social-imaginary relation, and is therefore necessarily false; its social function is not to give agents a true knowledge of the social structure but simply to insert them as it were into their practical activities supporting this structure. Precisely because it is determined by its structure, at the level of experience the social whole remains opaque to the agents. In class-divided societies this opacity is over-determined by class exploitation and by the forms which this exploitation takes in order to be able to function in the social whole. Hence, even if it includes elements of knowledge, ideology necessarily manifests an adequation / inadequation vis-à-vis the real.