The work deals with the research of concepts of spirituality, labels specific to Catholic and Christian spirituality, and the concept of mysticism. In the center of the work are the mystical phenomena of the life of a famous Catholic saint and stigmatic, St. Padre Pio. Based on the arguments presented and the literature researched in detail, it is shown that he was an authentic Catholic mystic who not only lived with all his strength according to the principles of Catholic spirituality and faith but with his humility left for all time an indelible trace of an exemplary role in the field of spirituality, not only for believers but for all people who explore spirituality. This saint is proof of how many spiritual fruits can be achieved if one has firm faith and trust in God. The paper mentions the most significant mystical phenomena of this saint, such as the stigmata, the gift of reading hearts, bilocation, and victim souls. In the end, the positive spiritual fruits of his mystical life are shown, which are visible in the area of people's conversions, miraculous healings, and the salvation of many souls from purgatory. Also at the end, the peculiarities of his mysticism are emphasized, which can be seen in a life full of suffering and in the daily fight against Satan, which can be the answer for all Christian skeptics who either doubt or categorically reject the possibility of the existence of the Devil.