"If I should say anything that is not in conformity with what is held by the Holy Roman Catholic Church, it will be through ignorance and not through malice. This may be taken as certain, and also that, through God's goodness, I am, and shall always be, as I always have been, subject to her."

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Just as in one man there is one soul and one body, yet many members; even so the Catholic Church is one body, having many members. The soul that quickens this body is the Holy Spirit; and therefore in the Creed after confessing our belief in the Holy Spirit, we are bid to believe in the Holy Catholic Church.

— Thomas Aquinas