Aged 51, Yeats proposed to 24 year old George Hyde-Lees (1892–68) in 9/16. They wed on 10/20/16. The marriage was successful, with two children, Anne & Michael. Later he may've had affairs, yet she wrote him: "When you are dead, people will talk about your love affairs, but I shall say nothing, for I will remember how proud you were."
Yeats & George practiced automatic writing involving her contacting various 'Instructors'. The spirit guides communicated a complex system of esoteric characters & history which they developed during trances & expositing phases, cones & gyres. He devoted much time to preparing material for publication. He wrote to publisher T. Werner Laurie in '24: "I dare say I delude myself in thinking this book my book of books".
Yeats' A Vision: An Explanation of Life Founded upon the Writings of Giraldus & upon Certain Doctrines Attributed to Kusta Ben Luka was privately published in '25. It covers poetic, philosophic, historic & astrologic topics arising thru these experiments, meditating on relations between imagination & the occult. A revised edition appeared in '37.
Packet for Ezra Pound
Stories of Michael Robartes & his friends: an extract from a record made by his pupils
The phases of the moon
Book 1: The great wheel
Book 2: The completed symbol
Book 3: The soul in judgment
Book 4: The great year of the ancients
Book 5: Dove or swan
All Soul's Night: an epilogue