The Secret Doctrine

H. P. Blavatsky’s The Secret Doctrine (1st ed., 1888), in two volumes. Presented here at the Book / Part / Addenda level; the source’s fine-grained stanza headings are too inconsistent for a reliable per-stanza split.

This text is divided into the following 6 parts (also listed in the sidebar):

• Book I, Part I — Cosmogenesis (the Stanzas of Dzyan)
• Book I, Part II — The Evolution of Symbolism
• Book I, Part III — Science and the Secret Doctrine Contrasted (with Addenda)
• Book II, Part I — Anthropogenesis
• Book II, Part II — The Archaic Symbolism of the World-Religions
• Book II — Addenda

Source. https://sacred-texts.com/the/sd/
Public-domain basis. Public domain in the US and the UK/EU with no restrictive caveat.