Pentimento

A♦t the beginning of Purg. 29, Matilda sang the psalm

Beati quorum tecta sunt peccata!

Blessed are those whose sins are covered.

Purg. 30-31 are clearly cantos of repentence, which in Italian is pentimento.

Readers of Lillian Hellman know that pentimento acquired another meaning, much later on:

pen·ti·men·to

Pronunciation:

\ˌpen-tə-ˈmen-(ˌ)tō\

Function:

noun

Inflected Form(s):

plural pen·ti·men·ti \-(ˌ)tē\

Etymology:

Italian, literally, repentance, correction, from pentire to repent, from Latin paenitēre — more at penitent

Date:

1853

: a reappearance in a painting of a design which has been painted over

More at the Britannica: pentimento