“He would rather burst a city gate than find it open to admit him.”

Das Lichtmikroskop öffnete das erste Tor zum Mikrokosmos. Das Elektronenmikroskop öffnete das zweite Tor zum Mikrokosmos. Was werden wir finden wenn wir das dritte Tor öffnen?
as quoted by Nan Yao, director of the Imaging and Analysis Center at the Princeton Materials Institute, in the Princeton Weekly Bulletin, February 26, 2001, Vol. 90, No. 18 http://www.princeton.edu/~iac/pwb2_26b.html.

Guide for the Perplexed (c. 1190), Introduction
Context: Having concluded these introductory remarks I proceed to examine those expressions, to the true meaning of which, as apparent from the context, it is necessary to direct your attention. This book will then be a key admitting to places the gates of which would otherwise be closed. When the gates are opened and men enter, their souls will enjoy repose, their eyes will be gratified, and even their bodies, after all toil and labour, will be refreshed.

"The God and His Man", Asimov's Science Fiction, 1980, Reprinted in Gene Wolfe, Endangered Species (1989), Reprinted in Gene Wolfe, The Best of Gene Wolfe (2009)
Fiction

"Although innumerable beings have been led to Nirvana no being has been led to Nirvana", §5, p. 85
Knots (1970)

Source: How to Argue and Win Every Time (1995), Ch. 6 : The Power of Prejudice : Examining the Garment, Bleaching the Stain, p. 98
Source: How to Argue & Win Every Time: At Home, At Work, In Court, Everywhere, Everyday

Lazy Days
Life Thru a Lens (1997)

Coming into the Country (1976) page 130

As quoted in "Erdogan Threatens to Let Migrant Flood Into Europe Resume" http://www.nytimes.com/2016/11/25/world/europe/turkey-recep-tayyip-erdogan-migrants-european-union.html?smid=fb-nytimes&smtyp=cur&_r=0, The New York Times (November 25, 2016)