“Among the calamities of war may be justly numbered the diminution of the love of truth, by the falsehoods which interest dictates and credulity encourages.”

Must We Go to War? (1937)

Source: Brave New World Revisited (1958), Chapter 11 (p. 104)

War (1816)
Context: War is to be ranked among the most dreadful calamities which fall on a guilty world; and, what deserves consideration, it tends to multiply and perpetuate itself without end. It feeds and grows on the blood which it sheds. The passions, from which it springs, gain strength and fury from indulgence.

"Plutarch's Lives," Vol 1, Barnes & Noble Inc., 2006, Lysander p. 646
Translation from Greek originalː "τὸ ἀληθὲς οὐ φύσει τοῦ ψεύδους κρεῖττον ἡγούμενος, ἀλλ' ἑκατέρου τῇ χρείᾳ τὴν τιμὴν ὁρίζων."

Letters On a Regicide Peace (1796)

The one-sentence peace message summarizing her ideas. Ch. 3 : The Pilgrimage
Peace Pilgrim: Her Life and Work in Her Own Words (1982)

As translated in 1,001 Pearls of Wisdom (2006) by David Ross, p. 36
Context: Cling to truth and it turns into falsehood. Understand falsehood and it turns into truth. Truth and falsehood are two sides of the same coin. Neither accept one nor reject the other.

Misattributed