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Psalm 119:39
Take away my disgrace that I dread,
for your ordinances are good.
Sortes biblicae consists of seeking guidance by selecting a random passage from the Bible. A form of bibliomancy, the practice is ancient, and common to many religious traditions, including Jewish, Christian, and Muslim.
The canons of the council of Vannes in A.D. 461 are sometimes quoted as a condemnation of the practice; but note what it actually says:
Some clergy are devoted to the interpretation of signs, and under the label of what pretends to be religion—what they call Saints’ Lots (sanctorum sortes)—they profess a knowledge of divination, or by looking into any kind of writings whatever they predict future events. Any cleric found either to have consulted or expounded this should be considered estranged from the church. (See Christian Divination in Late Roman Gaul: The Sortes Sangallenses by William E. Klingshirn, brill.com/previewpdf/book/edcoll/9789047407966/B9789047407966-s005.xml; emphasis on using any kind of writings whatever, and predicting future events).
Modern condemnation of the practice often includes the emotionally-charged term “fortune-telling.” I will assert that in the following passage, Saint Augustine was not “fortune-telling”:
So was I speaking and weeping in the most bitter contrition of my heart, when, lo! I heard from a neighbouring house a voice, as of a boy or girl, I do not know, chanting, and oft repeating, “Take up and read; Take up and read.” Instantly, my countenance altered, I began to think most intently whether children in any kind of play were in the habit of singing such words; I could not remember ever to have heard the like. So checking the torrent of my tears, I arose, interpreting it to be no other than a command from God to open the book, and read the first chapter I should find. For I had heard of Antony, that coming in during the reading of the Gospel, he received the admonition, as if what was being read was spoken to him: “Go, sell all that you have, and give to the poor, and you shall have treasure in heaven, and come and follow me”; and by such oracle he was immediately converted unto You. Eagerly then I returned to the place where Alypius was sitting; for there had I laid the volume of the Apostle when I arose. I seized, opened, and in silence read that section on which my eyes first fell: “Not in rioting and drunkenness, not in promiscuity and wantonness, not in strife and envying; but put on the Lord Jesus Christ, and make no provision for the flesh, in lustfulness.” No further would I read; nor needed I; for instantly at the end of this sentence, by a light as it were of serenity that was infused into my heart, all the darkness of doubt vanished away. (The Confessions of Saint Augustine, Book VIII, chapter XII; see the translation by Edward Bouverie Pusey at www.sacred-texts.com/chr/augconf/aug08.htm.)
Modern condemnation also objects to the taking of scripture out of context. Leaving aside the observation that the apostles often quoted scripture out of context, and that context and age-of-reason hermeneutics are not taught in the Bible, nothing prevents the study of the context of a passage obtained by sortes biblicae, or conventional study in general.
Of course, it is possible to abuse the sortes biblicae, such as by trying to use the Bible to predict the stock market. You will have to follow your own conscience.
As to those who take lots out of the pages of the Gospel, although it is preferable that they do this rather than run to consult demons, nevertheless I am displeased with this custom of trying to turn the divine oracles to secular business and to the vanity of this present life, when they were intended to speak for the sake of another life. (Augustine, letter 55, 20:37, in Divining Gospel by Jeff W. Childers, doi.org/10.1515/9783110643497-002.)
Concerning the script:
It may be hard to make a random selection from a well-used book, especially if you are familiar with the contents. The script above allows you to make a truly random selection from the entire Bible.
It is common for scripts like this to let the computer generate a random verse in response to clicking a link. This script assigns verses to the pixels in the field above, but you are the one who makes the selection, as if opening the book; the computer does not do that for you. A small number of pixels are unassigned so that all the verses are represented by an equal number of pixels; if nothing happens when you click the field, click again.