The Secret Doctrine

The Secret Doctrine - H.P. Blavatsky - 1888
The Secret Doctrine builds on 3 fundamental propositions:
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The 1st proposition is that there is one underlying, unconditioned, indivisible Truth, variously called "the Absolute", "the Unknown Root", "the One Reality", etc.
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The 2nd proposition is "the absolute universality of that law of periodicity, of flux and reflux, ebb and flow".
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The 3d proposition is: "The fundamental identity of all Souls with the Universal Over-Soul... and the obligatory pilgrimage for every Soul—a spark of the former—through the Cycle of Incarnation (or 'Necessity') in accordance with Cyclic and Karmic law, during the whole term."