“God enters by a private door into every individual.”

"Entré por la puerta grande y salí por la puerta grande"
Attributed

Ben Yamen's Song of Geometry (1853)
Context: Geometry, to which I have devoted my life, is honoured with the title of the Key of Sciences; but it is the Key of an ever open door which refuses to be shut, and through which the whole world is crowding, to make free, in unrestrained license, with the precious treasures within, thoughtless both of lock and key, of the door itself, and even of Science, to which it owes such boundless possessions, the New World included. The door is wide open and all may enter, but all do not enter with equal thoughtlessness. There are a few who wonder, as they approach, at the exhaustless wealth, as the sacred shepherd wondered at the burning bush of Horeb, which was ever burning and never consumed. Casting their shoes from off their feet and the world's iron-shod doubts from their understanding, these children of the faithful take their first step upon the holy ground with reverential awe, and advance almost with timidity, fearful, as the signs of Deity break upon them, lest they be brought face to face with the Almighty.

As quoted in The Bright Side of Billy Wilder, Primarily (1970) by Tom Wood, p. 20

address http://www.papalencyclicals.net/Pius12/P12EXIST.HTM to the Pontifical Academy of Sciences, 22 November 1951
quoted in Time, 3 December 1951
quoted by Dan Brown, Angels and Demons, page 44

Source: The Summer Without Men

Source: The Last Temptation of Christ (1951), Ch. 10

Apostolic Letter Mulieris Dignitatem, 15 August 1988
Source: www.vatican.va http://www.vatican.va/holy_father/john_paul_ii/apost_letters/documents/hf_jp-ii_apl_15081988_mulieris-dignitatem_en.html