In The Threshold of the Spiritual World, Steiner describes various spiritual experiences, thus offering continually fresh points of view on the supersensible world. Steiner also presents clear suggestions for the reader's own practice of meditation. It has also been published as A Way of Self-knowledge.
It is a small book containing 16 short sections, each section dealing
with one or another aspect of Spiritual Science. The last section
discusses the relation between this book and two others which deal
with similar topics:
Occult Science — an Outline.