Considerations, undertaken by the article, lead to a conclusion that the reason and the faith as sources of knowing God are determined by many factors. Analyses of Zofia J. Zdybicka’s works show that the rational knowledge about God is conditioned with limits of the human nature, specificity of the Absolute Being’s nature, as well as historical and cultural contexts (which contain possibilities of common sense knowledge, and type of philosophical cognition). While the knowledge about God acquired through religious faith is shaped with the historical Revelation of Divine Persons, and forms of its social and personal reception. So if the reason and the faith have their own autonomy, i.e. spaces where they can be realized in accordance with their own natures, then it is not possible to give up on any of them without disturbing to know not only God, but the man as well.Paweł Tarasiewic