Cyril of Alexandria, on Jas 5:12

“But above all things, my brethren, swear not, neither by heaven, nor by the earth, nor by any other oath. But let your speech be, yea, yea: no, no: that you fall not under judgment.”

“Let the witness of our life be stronger than an oath, and if some shameless person dares to ask an oath from you, let your yes be yes and your no be no, instead of swearing an oath. James forbids us to swear by heaven or by earth for this reason, that we should not give the creation more value than it has by deifying it. For those who swear, swear by something greater than themselves, as the apostle says.”

Imported from an open dataset — not yet checked against the printed edition.