Grimlaicus’ Rule for Solitaries, 28.2
Around 900 CE., Grimlaicus, a solitary monk, living somewhere near Metz, France, wrote the Regula Solitariorum, a rule for solitary monks, at the behest of another named Grimlaicus.
Source: Grimlaicus. 2011. Grimlaicus: Rule for Solitaries, p. 90. Translated by Andrew Thornton. Cistercian Studies Series 200. Liturgical Press.
I am ashamed to bring up the topic of swearing oaths, not only because of the oaths but also because of perjury [see Matt 5:33-37]. If indeed swearing an oath is a sin and a transgression of a commandment, then what are we to say about perjury? Gospel truth does not allow an oath, even though every word is found to be trustworthy by means of the swearing of an oath [see Matt 18:16; Heb 6:17].