“Thought alone is eternal.”

Closer http://eidolon.net/?story=Closer (also published in Eidolon, Winter 1992)
Fiction, Axiomatic (1995)

Source: City of Fallen Angels

Isis Unveiled (1877), Vol. I Preface

Source: Morals and Dogma of the Ancient and Accepted Scottish Rite of Freemasonry (1871), Ch. XXII : Knight of the Royal Axe, or Prince of Libanus, p. 340
Context: Genuine work alone, done faithfully, is eternal, even as the Almighty Founder and Worldbuilder Himself. All work is noble: a life of ease is not for any man, nor for any God. The Almighty Maker is not like one who, in old immemorial ages, having made his machine of a Universe, sits ever since, and sees it go. Out of that belief comes Atheism. The faith in an Invisible, Unnameable, Directing Deity, present everywhere in all that we see, and work, and suffer, is the essence of all faith whatsoever.

Book 1. Compare: "He never is alone that is accompanied with noble thoughts", John Fletcher, Love's Cure, act iii. sc. 3.
The Countess of Pembroke’s Arcadia (1580)

Source: Rosencrantz and Guildenstern Are Dead

Source: I Know Why the Caged Bird Sings

The Rovers, Act i, Sc. 1, reported in Bartlett's Familiar Quotations, 10th ed. (1919). Compare: "Let us embrace, and from this very moment vow an eternal misery together", Thomas Otway, The Orphan, Act iv., Sc. 2.; "My fair one, let us swear an eternal friendship", Jean Baptiste Molière, Le Bourgeois Gentilhomme (published c. 1871), act iv. sc. 1.

Source: Mysteries