The principal reason for seeking the union of the churches is in order that this existing unity of the church may have a better opportunity to express itself and to grow. (religion-online.org)
The special, divine assistance of infallibility is a privilege attached to the Holy Father as the center of unity of the Church, yet this privilege is always given for the entire Church. (firstthings.com)
Note the implication in the first clause there: There are «those who no longer see the full, visible unity of the Church as an achievable goal.» (firstthings.com)