„True science discovers God in an ever-increasing degree — as though God were waiting behind every door opened by science.“

Letter (27 June 1760), published in The Works of the Rev. John Wesley (1813) Vol. XVI, p. 109
As quoted in an 1856 edition of Works
General sources
Varianta: Every one, though born of God in an instant, yea, and sanctified in an instant, yet undoubtedly grows by slow degrees.

Experimental Researches in Electricity, Vol. 2 (1834) p. 257 http://books.google.com/books?id=XuITAAAAQAAJ&vq=257&pg=PA257

“Der erste Trunk aus dem Becher der Naturwissenschaft macht atheistisch, aber auf dem Grund des Bechers wartet Gott.” in 15 Jahrhunderte Würzburg: e. Stadt u. ihre Geschichte [15 centuries Würzburg. A city and its history] (1979), p. 205, by Heinz Otremba. Otremba does not declare his source, and the quote per se cannot be found in Heisenberg's published works.
The journalist Eike Christian Hirsch PhD, a personal acquaintance of Heisenberg, whom he interviewed for his 1981 book Expedition in die Glaubenswelt, claimed in de.wikiquote.org on 22 June 2015, that the content and style of the quote was completely foreign to Heisenberg's convictions and the way he used to express himself, and that Heisenberg's children, Dr. Maria Hirsch and Prof. Dr. Martin Heisenberg, did not recognize their father in this quote.
Statements similar to the quote were made by Francis Bacon, in "Of Atheism" (1601): "A little philosophy inclineth man’s mind to atheism; but depth in philosophy bringeth men’s minds about to religion", and Alexander Pope, in "An Essay on Criticism" (1709): "A little learning is a dangerous thing; drink deep, or taste not the Pierian spring: there shallow draughts intoxicate the brain, and drinking largely sobers us again."
There is a passage in a lengthy essay written by Heisenberg in 1942, "Ordnung der Wirklichkeit” ("Reality and Its Order"), published in Collected Works. Section C: Philosophical and Popular Writings. Volume I. Physics and Cognition. 1927-1955 (1984), that parallels the ideas expressed in the quote (albeit in a much expanded form):
"The first thing we could say was simply: 'I believe in God, the Father, the almighty creator of heaven and earth.' The next step — at least for our contemporary consciousness — was doubt. There is no god; there is only an impersonal law that directs the fate of the world according to cause and effect... And yet [today], we may with full confidence place ourselves into the hands of the higher power who, during our lifetime and in the course of the centuries, determines our faith and therewith our world and our fate." (English translation by M.B.Rumscheidt and N. Lukens, available at http://www.heisenbergfamily.org/t-OdW-english.htm)
Carl Friedrich von Weizsäcker, a protégé of Heisenberg, did publish a version of the quote itself in Die Geschichte der Natur (The History of Nature) (1948), appearing to consider it an adage:
"Aus dem Denken gibt es keinen ehrlichen Rückweg in einen naiven Glauben. Nach einem alten Satz trennt uns der erste Schluck aus dem Becher der Erkenntnis von Gott, aber auf dem Grunde des Bechers wartet Gott auf den, der ihn sucht. Wenn es so ist, dann gibt es einen Weg des Denkens, der vorwärts zu religiösen Wahrheiten führt, und nur diesen Weg zu suchen ist lohnend. Wenn es nicht so ist, wird unsere Welt auf die Religion ihre Hoffnungen vergeblich setzen." ("From thinking there is no honest way back into a naive belief. According to an old phrase, the first sip from the cup of knowledge separates us from God, but at the bottom of the cup God is waiting for the one who seeks him. If so, then there is a way of thinking that leads to religious truths, and to seek only that way is rewarding. If it is not so, our world will put its hopes to religion in vain.")
Misattributed

Zdroj: Life of Galileo (1939)

"Switzerland", IV. "Parting" (1853)

From a letter to the California State board of Education (14 September 1972)

The Philosophy of Atheism (1916)

As quoted in Letter to an Atheist (2007) by Michael Patrick Leahy, p. 61
Originál: Le premier regard de l'homme jeté sur l'univers n'y découvre que variété, diversité, multiplicité des phénomènes. Que ce regard soit illuminé par la science, — par la science qui rapproche l'homme de Dieu, — et la simplicité et l'unité brillent de toutes parts.

" Karl Giberson is still fighting a rearguard battle against Adam and Eve https://whyevolutionistrue.wordpress.com/2015/06/13/karl-giberson-is-still-fighting-a-rearguard-battle-against-adam-and-eve/" June 13, 2015

Tears and Saints (1937)

Miscellaneous Quotes On the Subjects of Magic and Magicians
Zdroj: [Lévi, Éliphas, Blavatsky, H. P., Paradoxes of the Highest Science, 2007, Wildside Press LLC, 9781434401069, 15, https://books.google.com/books?id=oIglEl6BJFoC&q=The%20Paradoxes%20of%20the%20Highest%20Science&pg=PA5]

This alleged quotation is attributed to Pasteur at least as early as 1952, in Miracles, by Morvan Lebesque. It appears in a letter about Pasteur reprinted in the February 7, 1920 issue of America magazine, but the author of the letter attributes the saying to Pascal and says it applies to Pasteur. It may be a paraphrase of Francis Bacon, in "On Atheism" in Essays (1597): A little Philosophy inclineth Mans Minde to Atheisme; But depth in Philosophy, bringeth Mens Mindes about to Religion.
Misattributed

Zdroj: Darkly Dreaming Dexter

Zdroj: Dictionary of Burning Words of Brilliant Writers (1895), P. 312.

Letter to Roger C. Weightman http://www.rjgeib.com/thoughts/jefferson/jefferson.html, declining to attend July 4th ceremonies in Washington D.C. celebrating the 50th anniversary of Independence, because of his health. This was Jefferson's last letter http://www.rjgeib.com/thoughts/jefferson/jefferson.html. (24 June 1826)
1820s
Kontext: All eyes are opened, or opening, to the rights of man. The general spread of the light of science has already laid open to every view the palpable truth, that the mass of mankind has not been born with saddles on their backs, nor a favored few booted and spurred, ready to ride them legitimately, by the grace of God. These are grounds of hope for others. For ourselves, let the annual return of this day forever refresh our recollections of these rights, and an undiminished devotion to them.

"Axiomatic Thought" (1918), printed in From Kant to Hilbert, Vol. 2 by William Bragg Ewald

“The Open Door,” p. 44
Circling: 1978-1987 (1993), Sequence: “A Grain”

Zdroj: Attributed in posthumous publications, Einstein and the Poet (1983), p. 98