This paper presents how the mystical life of the Polish mystic Sister Roberta Babiak began, developed and manifested itself. The author discusses the particular stages in her mystical life: from expurgation, through partial union, up to transforming deifying union. In this way, the author illustrates the dynamics of Sister Babiak’s faith and expounds its major functions: help to achieve deeper cognition of the redemptive truths; to get to know God Himself as well as to build communion with Him. The author also examines the attributes of this faith, emphasising the fact that it is ecclesiastical faith, shaped in the harmony with the ecclesiastical heritage and teaching. It is a light and a dark kind of faith, simultaneously: it grants a special gift for understanding the Revelation, but it also is an initiation into the mystery of the secret God. This is a living faith – rich in the gifts of the Holy Spirit – leading to the mystical experience: meeting God, Son and the Holy Spirit inside the mystic.
