what does the nuncio says in directing the reading of the bull

The nuncio usually says a short formal introduction before the bull is read, then hands it over to be proclaimed aloud. In one example from an episcopal ordination, after the reading he said it was “truly a fitting day to celebrate with great joy an extraordinary event of grace,” and then offered blessings and wishes for the new bishop’s ministry.

What the nuncio does

The papal nuncio is the Pope’s representative, so during the reading of the bull of appointment he typically:

• Announces or directs the reading of the papal bull.
• Affirms that the Pope has appointed the bishop.
• Offers a brief congratulatory or pastoral message afterward.

What the bull is

A papal bull in this setting is the official document announcing the appointment of a bishop, and it is commonly read aloud during the ordination or installation liturgy. The reading itself is a symbolic part of the ceremony that publicly confirms the appointment.

If you meant the exact wording

The exact words vary by ceremony and by country, but the phrasing is usually formal and liturgical rather than fixed line-for-line. A published example shows the nuncio speaking after the reading about joy, grace, and the new bishop’s mission, which suggests the role is both ceremonial and pastoral.

Bottom line

So, the nuncio does not say one universal sentence; he normally directs the reading of the bull and then gives a formal address tied to the appointment.