The striking use of red and blue in this work (and in the pointillist - inspired portraits on show) relates not only to Mondrian's interest in Goethe's colour theories, but also more profoundly to his enthusiasm for theosophy, which fuelled his desire for a more spiritual form of pictorial representation. (apollo-magazine.com)
The subjective or spiritual forms take precedence over the material. (religion-online.org)
Some rejected all forms of life after death, including the possibility of resurrection; some recognized man's mortality but looked for a physical resurrection as man's only hope, and then only for some; for some the resurrection hope was to be understood more universally and in varying spiritual forms; some thought in terms of the immortality of the soul and then could dispense with resurrection talk altogether. (religion-online.org)