A historian (also of medicine) should accept the values and canons of the studied culture, including medical ones, as their own. As Florian Znaniecki pointed out in his works, they should be the researcher’s highest authority. This means that the researcher should deviate from evaluating the ideas and practices of the studied culture from their own perspective. The category of minimal cultural imputation developed by Wojciech Wrzosek shows that it is not an easy process. However, the application of the subjective-rational perspective to the interpretation has already become an obvious approach. An open and much less obvious problem is the role of the historian of science when they venture to make comparisons between past and present scientific cultures. By doing so, do they still remain a historian, or – by undertaking such comparisons and evaluations – do they abandon the role, assuming the position of, for example, methodologist? The author of the article outlines the possibilities of separating these roles, presenting the attitude of a ‘methodologist’ who searches in the past for the roots and theoretical justifications for contemporary paradigms of their discipline, using the latter to evaluate the past. However, the possibility of a non-evaluative dialogue between the cognizing culture and the cognized culture is also shown, where the former also includes the specialist knowledge of a contemporary researcher interested in the past of their discipline. The historiography of a given science appears here as a record of the self-knowledge of a given generation of researchers – as their self-reflection. As Jan Pomorski calls it, a researcher assuming such a role appears as homo metahistoricus in their field of study.