It's not even correct - "thy arrogance" should be "thine arrogance"

when thou least expect it.

Should be “when thou expectest it least”

lest thou tear thy hair

Should be “lest thou tearest thine hair” as I seem to recall the h sound acting like vowel for words that sound different based on what follow them.

lest grievous harm befall thy program.

Should be “befalleth”

Too bad you can't "requesteth a pull" to update the language a bit.

I believe "-eth" is a 3rd person ending (he/she/it), e.g. If thy header files fail should be "faileth".

"The third person sing. Present, ending in th, as taketh, bringeth &c. is now confined to sermons and grave discourse." - John Hunter, Text-book of English Grammar 1848

My favourite -eth, from the start of Moonlighting's Atomic Shakespeare episode:

Good morrow, sir. I'm Lucentio, come hither for to see fair Padua, pleasant garden of great Italy, to seek out and happily begin a course of learning and studies herein.

You've mistaken me, sir, for someone who careth.

https://youtu.be/ijUr6p8xSBM?t=140

I, for one, prefer my bibles with interspersed lines of Ancient Greek, so that you can interpret yourself. Our language will never keep changing, but the source remains the same.

The Ten Commandments were originally written in ancient Hebrew. They were passages in the Hebrew Bible, which the Christians later adopted as the Old Testament. It was the New Testament that was originally written in Greek.