The article presents the results of a comprehensive study of the complex cognitive-linguistic mechanisms underlying the formation and representation of spiritual-philosophical concepts in J. O'Donohue's "Anam Cara: Spiritual Wisdom from the Celtic World" (1997). Drawing on cognitive linguistics, philosophy, and cultural studies, the study illuminates how spirituality is constructed using linguistic devices in the text studied. Our findings contribute to the growing body of scientific knowledge in cognitive psychology, linguistics, and cultural studies as they elucidate the intertwined nature of cognitive processes, linguistic factors, and cultural influences in forming and interpreting spiritual and philosophical concepts. Our findings indicate that images and metaphors related to the concepts of the soul, light, and mystery are frequently employed in expressing spiritual and philosophical ideas in the novel through personifications, juxtapositions, and syntactic constructions such as parallelisms and antitheses. In conclusion, such interdisciplinary research provides a foundation for further exploration and refinement of theoretical frameworks and methodologies in these fields, contributing to research and practical application advances.