“Ever since I adopted the rule of "That which can be destroyed by the truth should be," I've also come to realize "That which the truth nourishes should thrive."”
When something good happens, I am happy, and there is no confusion in my mind about whether it is rational for me to be happy. When something terrible happens, I do not flee my sadness by searching for fake consolations and false silver linings. I visualize the past and future of humankind, the tens of billions of deaths over our history, the misery and fear, the search for answers, the trembling hands reaching upward out of so much blood, what we could become someday when we make the stars our cities, all that darkness and all that light — I know that I can never truly understand it, and I haven't the words to say.
Feeling Rational http://lesswrong.com/lw/hp/feeling_rational/ (April 2007)
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Eliezer Yudkowsky 56
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“I was run over by the truth one day.
Ever since the accident I've walked this way”
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Guide for the Perplexed (c. 1190), Introduction
Context: My object in adopting this arrangement is that the truths should be at one time apparent and at another time concealed. Thus we shall not be in opposition to the Divine Will (from which it is wrong to deviate) which has withheld from the multitude the truths required for the knowledge of God, according to the words, "The secret of the Lord is with them that fear Him." (Psalm 25:14)

Quinn (ed), Faithful History: Essays On Writing Mormon History, p 103, fn 22

“If it can be destroyed by the truth, it deserves to be destroyed by the truth.”
"That which can be destroyed by the truth, should be." — P. C. Hodgell, in her 1994 novel Seeker's Mask.
Misattributed

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 264.

“Man should know from this rule that he is cut off from truth.”
Source Book in Ancient Philosophy (1907), The Fragments

Coth, in Book Four : Coth at Porutsa, Ch. XXVI : The Realist in Defeat
The Silver Stallion (1926)