Thomas Aquinas

Coarseness of attire is sometimes a sign of sorrow: wherefore those who are in sorrow want to wear coarser clothes, just as on the other hand in times of festivity and joy they wear finer clothes. Just as a man’s mind is uplifted by fine clothes, so is it humbled by lowly apparel.

God is said ‘to change His mind,’ metaphorically, inasmuch as He bears Himself after the manner of one who repents, by ‘changing His sentence, although He does not change His plan.