In 1890, he passed his Abitur at the humanistischen Grossherzoglichen Gymnasium in his home city of Karlsruhe, and then completed his one-year military service as a volunteer.

Mombert managed also to visit a multitude of other countries: Egypt, Algeria, Greece, The Netherlands, Croatia, Morocco, Monaco, Norway, Austria, Portugal, Spain, Sweden, Syria, Czechoslovakia, and Tunisia.

This intense study, along with serious contact with the works of Friedrich Nietzsche, and a visionary, life-defining experience from January 1894 lay the groundwork for a kind of mythological-cosmological private religion that he developed through subsequent poetry after The Glowing One.

He, however, was friendly with other artists and writers of the time such as: Hans Carossa, Ida, Richard Dehmel, Martin Buber, Max Dauthendey, Herbert Eulenberg, Hermann Hesse, Gustav Landauer, Rudolf Pannwitz, Hans Reinhart, Emanuel Lešehrad, who translated portions of his work into Czech, Hermann Haller, Karl Hofer, Arthur Zweiniger, Emil Rudolf Weiß, who made a portrait of him, and Gustav Wolf, who created images to accompany Mombert's poetry.

Letters also indicate, despite great distances, Mombert maintained a love affair with a long-unknown pianist, with the alias Vasanta, who has since been identified as Charlotte Kaufmann (1880-1960).