“If one would a It is impossible for us in words to describe the ineffable dignity of the soul and we cannot in any way comprehend it prepare an empty place in the depths of the soul
there can be no doubt that God must fill it at once.
If there were a void on earth the heaven would fall to fill it….”

This has similarly been attributed to Buchan, but is actually a misrendering of a sentence from the first paragraph of John Bunyan, Discourse on Prayer. Bunyan's original sentence reads: "It is the opener of the heart of God, and a means by which the soul, though empty, is filled."
Misattributed

Letter XVIII.
Letters

"No Religion is an Island", p. 266
Moral Grandeur and Spiritual Audacity: Essays (1997)

Quote of Dupré in 1875; as quoted by Albert Wolff, 1880's, in Notes upon certain masters of the XIX century, - printed not published MDCCCLXXXVI (1886), The Art Age Press, 400 N.Y. (written after the exhibition 'Cent Chefs-d'Oeuvres: the Choice of the French Private Galleries', Petit, Paris / Baschet, New York, 1883, p. 16
When Corot died in 1875, Jules Dupré spoke these short words about his friend

Source: 4.48 Psychosis

Source: A Dictionary of Thoughts, 1891, p. 545; also reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 203.

Jami al-Uloon wa'l-Hikm, p. 363

[2019, Esoterism as Principle and as Way, World Wisdom, 116, 978-1-93659765-9]
God, Outline

Notes on the Parables, Prodigal Son; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 321.