John Cassian

In his own words on Jonah

• Jonah 3:8

  Nor, indeed, ought this to influence us as a precedent for our daily life, that Joram, the wicked king of Israel, when surrounded by bands of his foes, rent his clothes, and is said to have had sackcloth inside them; or that the Ninevites, in order to mitigate the sentence of God, which had been pronounced against them by the prophet, were clothed in rough sackcloth. The former is shown to have been clothed with it secretly underneath, so that unless the upper garment had been rent it could not possibly have been known by any one, and the latter tolerated a covering of sackcloth at a time when, since all were mourning over the approaching destruction of the city and were clothed with the same garments, none could be accused of ostentation. For where there is no special difference and all are alike no harm is done.

  The Twelve Books on the Institutes of the Coenobia, Book 1, Chapter 2