17 Meanwhile, venerable brothers, before bringing this letter to a close, We must express Our congratulations on the striking harmony and concord which unites your minds among yourselves and with this apostolic see. This perfect union We regard as not merely an impregnable bulwark against hostile attacks, but also as an auspicious and happy omen, presaging better times for the Church; and, while it yields great relief to Our weakness, it seasonably encourages Us to endure with readiness all labors and all struggles on behalf of God's Church in the arduous task which We have undertaken.
Source: Inscrutabili Dei Consilio (Vatican.va)