- From the human point of view
- Conquest of Time
- God – The Need of Spirituality
- Leven in het innerlijke goddelijke licht
- Leven in het nu
- Plato
- Popol Vuh
- Spirit and Matter
- The Embryo in the Golden Womb
- Thoughts on the Future (from the 20th century)
- Universal Intelligence or Cosmic Mind
- A Though on Oddities in Science
- A Thought about Non-physical phenomena and their explanation
- A Thought of H.P. Blavatsky on Education
- A Thought on Cosmology and Cosmography
- A Thought on Education
- A Thought on Intercultural Philosophy
- A Thought on Medicine
- A Thought on Music Music and Arts
- A Thought on Occult Sciences
- A Thought on Politics
- A Thought on the Occult and natural sciences, their relation and complementarity
- Eternal Change, Eternal Essence and Daily Theosophy
- In het Nu
- on Evolution
- Thought about what Theosophy is
- A Thought on Theosophy and Education
