The article analyzes the theme of the psychology of religion by the American psychologist William James. It is treated in the context of the works of other pioneers of psychological science at that time. James saw positive sides in religiosity/faith: it is a stimulating factor in life, an integrating aspect of human maturation and even a fundamental factor in human spiritual hygiene. Without religion, it is difficult to achieve the meaning of life, and empirical science, in his opinion, was increasingly eroding the foundations of religion. Therefore, in search of a way out, he tried to create the so-called optimistic philosophy. James explained that a psychologist can be just as objectively interested in religious phenomena as in other everyday psychological matters. Psychology can study theological phenomena, but there is one limitation – psychological research is limited to the area of human feelings and will, which means that it does not study doctrinal questions of the Church institution. The sanctity provided by faith helps a person to gain psychological balance, opens new horizons of life, broadens horizons and gives hope for eternity.
The analysis of the article focuses on the process of spiritual growth as integral component of every Christian life. The terminological and theoretical spectrum of this phenomenon is discussed together with elaboration of the dynamics, structure, and stages of spiritual growth. The significance of spiritual growth from the biblical and Church Magisterium perspectives is actualized. From these perspectives the process of spiritual growth is seen as a universal calling of the Church and its members. The possible linkages between theology and psychology are discussed as ways which can help to retain the holistic approach to the personal growth and one’s relationship with God.