“opened the door a crack wide enough for the entire world to pass through.”

The House of Dust (1916 - 1917)

Homily of His Holiness John Paul II for the Inauguration of his Pontificate, St. Peter's Square, Vatican City, on Sunday, 22 October 1978. Archived https://web.archive.org/web/20220324025630/https://www.vatican.va/content/john-paul-ii/en/homilies/1978/documents/hf_jp-ii_hom_19781022_inizio-pontificato.html from the original https://www.vatican.va/content/john-paul-ii/en/homilies/1978/documents/hf_jp-ii_hom_19781022_inizio-pontificato.html on March 24, 2022.
Other Quotes by Pope John Paul II

Source: My Sister's Keeper

Source: Ordinary People

Source: Ender's Game

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.

Source: A Year in the World: Journeys of a Passionate Traveller