Source: The Quincunx of Time (1973), Chapter 8, “The Courtship of Posi and Nega” (p. 84; ellipsis in the original)
“We are blessed with a faith, which calls into action the whole intellectual man; which prescribes a reasonable service; which challenges the investigation of its evidences; and which, in the doctrine of immortality, invests the mind of man with a portion of the dignity of Divine intelligence.”
Edward Everett, reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 140.
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Edward Everett 12
American politician, orator, statesman 1794–1865Related quotes

Spiritual Freedom http://www.americanunitarian.org/spiritualfreedom.htm (1830)
Context: I call that mind free, which masters the senses, which protects itself against animal appetites, which contemns pleasure and pain in comparison to its own energy, which penetrates beneath the body and recognises its own reality and greatness, which passes life, not in asking what it shall eat or drink, but in hungering, thirsting, and seeking after righteousness.
I call that mind free, which escapes the bondage of matter, which, instead of stopping at the material universe and making it a prison wall, passes beyond it to its Author, and finds in the radiant signatures which everywhere bears of the Infinite Spirit, helps to its own spiritual enlightenment.
I call that mind free, which jealously guards its intellectual rights and powers, which calls no man master, which does not content itself with a passive or hereditary faith, which opens itself to light whencesoever it may come, which receives new truth as an angel from heaven.
I call that mind free, which sets no bounds to its love, which is not imprisoned in itself or in a sect, which recognises in all human beings the image of God and the rights of his children, which delights in virtue and sympathizes with suffering wherever they are seen, which conquers pride, anger, and sloth, and offers itself up a willing victim to the cause of mankind.
“What is liberal education,” p. 8
Liberalism Ancient and Modern (1968)

The Limits of State Action (1792)

The Tragic Sense of Life (1913), II : The Starting-Point

" The Life and Teachings of Thoth Hermes Trismegistus http://magdelene.net/Thoth%20Hermes%20Trismegistus.htm", in The Secret Teachings of All Ages (1928) by the Canadian occultist Manly Hall; a few quotation websites credit this to Addison.
Misattributed

“Faith makes it possible to achieve that which man's mind can conceive and believe.”
Part 6 "Beyond System — The Ultimate Source of Jeet Kune Do"
Jeet Kune Do (1997)