Christianity/Islam: Essays on Esoteric Ecumenicism
Echoes of Perennial Wisdom
Esoterism as Principle and as Way
The Eye of the Heart
From the Divine to the Human
The Garland: (Poems)
Gnosis: Divine Wisdom
In the face of the Absolute
Language of the Self
Light on the Ancient Worlds

Logic and Transcendence
The Play of Masks
Road to the Heart: Poems
Roots of the Human Condition
Spiritual Perspectives and Human Facts
Stations of Wisdom
Sufism: Veil and Quintessence
Survey of Metaphysics and Esoterism
To Have a Center
The Transfiguration of Man
Treasures of Buddhism
Understanding Islam