The article aims to investigate the semantic and evocative value that Etty Hillesum attributes in her diaries to the word "God". The spiritual path of the young Jewish writer plays an important role here beginning with her contact with the Jungian psychotherapist Julius Spier in 1941, in light of the reception of his literary models and in particular of the German poet Rainer M. Rilke. After a section devoted to the literary and personal reasons that hindered Hillesum's naming of God, the essay focuses on the "tiring journey", the inner progress that leads the writer to transform her interior difficulties in space for the ineffable, mystical experience of God: a divine love of God that can be discovered at the same time internally and externally, impersonally and personally, at transcendent and immanent levels.