Piccarda answers Dante’s question of whether the souls in the lowest sphere of Heaven wish they were higher: they do not, because their will is wholly aligned with God’s. Matthew Arnold singled out the Italian line as a “touchstone” of the highest poetry.
✓Public domain
Dante wrote the Paradiso around 1316–1321, so the original Italian is long in the public domain. “In His will is our peace” is the standard, near-verbatim literal English of a six-word half-line, and appears freely in public-domain sources (e.g. Matthew Arnold’s 1880 “The Study of Poetry”); it is not the distinctive expression of any single modern translator. A full modern verse translation of the whole poem, however, may itself be under copyright.
⚠ This reflects the original work, which is public domain. If your exact English wording comes from a specific modern translation, that translation may itself still be under copyright — check the edition you quote.