In this, then, we ought to be all of one mind, so that, according to apostolic teaching, we may all say the same thing, and that there be no divisions among us. Let us then be perfect in the same mind, and in the same judgment - Saint Pope Callistus the First.

Saint Callistus, you did not come from nobility but from slavery. Though you suffered greatly, God used those sufferings to form you into a man with a merciful heart who sought to reconcile every sinner with Him. Please pray for us, that we will be open to God’s abundant mercy in our lives and show that mercy to others without exception. Saint Callistus, pray for us. (My Catholic Life)