In many abstract domains of discourse, there are notion metaphors associated with two major human senses: sight and hearing. In the domain of knowledge and cognition, the metaphor 'WIEDZIEC TO WIDZIEC' (to know is to see) seems predominant. However, the author of the article shows that in the process of conceptualization of 'SUMIENIE' (conscience), the domain of hearing seems more important than the one of sight: 'WIEDZIEC TO SLYSZEC' (to know is to hear), or to put it differently: 'POZNANIE DOBRA I ZLA TO SLYSZENIE' (to know good and evil is to hear). The analysis of the metaphorical phrase shows conceptualization of what is restrictive, associated with the domain of hearing, as the sense which is rather passive and subjecting an individual (usually in colloquial speech). The image pattern of 'MANIPULACJA' (manipulation) is also associated with the Christian model, which offers a rather active attitude of the agent of action, letting his conscience undergo the 'formation' process, according to the desired ideal. The pattern of 'MANIPULACJA' corresponds to the one of 'SLYSZENIE', which also in this model stresses the activeness of the agent: 'SUMIENIE TO WEWNETRZNY GLOS NAKAZUJACY CZYNIENIE DOBRA' (conscience is the inner voice ordering to do what is good).