“But youth smiles without any reason. It is one of its chiefest charms.”

Page 437 https://books.google.com/books?id=-F8wAQAAMAAJ&pg=PA437. Quote republished in " Left and Right: The Prospects for Liberty http://alexpeak.com/twr/lar/1/1/2/," Left and Right: A Journal of Libertarian Thought 1, no. 1 (Spring, 1965), pp. <span class="plainlinks"> 21 http://alexpeak.com/twr/lar/1/1/2/#p21– 22 http://alexpeak.com/twr/lar/1/1/2/#p22</span>.
"Youth" (1912), II
Context: In this conflict between youth and its elders, youth is the incarnation of reason pitted against the rigidity of tradition. Youth puts the remorseless questions to everything that is old and established,—Why? What is this thing good for? And when it gets the mumbled, evasive answers of the elders, it applies its own fresh, clean spirit of reason to the institutions, customs, and ideas, and finding them stupid, inane, or poisonous, turns instinctively to overthrow them and build in their place the things with which its visions teem.

Amore e 'l cor gentil sono una cosa...
e così esser l'un sanza l'altro osa
com'alma razional sanza ragione.
Source: La Vita Nuova (1293), Chapter XVI (tr. Mark Musa)

Speech on May 1, 1937, quoted in John S. Conway, The Nazi Persecution of the Churches, 1933-45 (New York, NY, Basic Books, 1968), p. 178
1930s

Source: Tender Is the Night

Source: Howards End (1910), Ch. 33

Source: As quoted in The Rise and Fall of the Third Reich: A History of Nazi Germany, William L. Shirer, Simon & Schuster Paperbacks, New York, 1990, p. 249 (May 1, 1937)

Source: The Story of My Life

The Fall (1956)