I. He rejoices over Juvenal's return to orthodoxy, though chiding him for having gone astray.
Leo, bishop of the city of Rome, to Juvenal, bishop of Jerusalem.
When I received your letter, beloved, which our sons Andrew the presbyter and Peter the deacon brought me, I rejoiced indeed that you had been allowed to return to the seat of your bishopric; but when all the reasons came to my remembrance, which brought you into such excessive troubles, I grieved to think you had been yourself the source of your adversities by failing in persistency of opposition to the heretics: for men can but think you were not bold enough to refute those with whom when in error you professed yourself satisfied. For the condemnation of Flavian of blessed memory, and the acceptance of the most unholy Eutyches, what was it but the denial of our Lord Jesus Christ according to the flesh? Which He Himself of His great mercy caused to be overthrown, when by the authority of the holy Council of Chalcedon He brought to nought that accursed judgment of the Synod of Ephesus without debarring any of the attainted from being healed by correction. And therefore, because in the time of long-suffering, you have chosen return to wisdom rather than persistency in folly, I rejoice that you have so sought the heavenly remedies as at last to have become a defender of the Faith which is assailed by heretics. For, though no priest ought to be ignorant of that which he preaches, yet any Christian living at Jerusalem is more inexcusable than all the ignorant, seeing that he is taught to understand the power of the Gospel, not only by the written word but by the witness of the places themselves, and what elsewhere may not be disbelieved, cannot there remain unseen. Why is the understanding in difficulty, where the eyes are its instructors? And why are things read or heard doubtful, where all the mysteries of man's salvation obtrude themselves upon the sight and touch? As if to each individual doubter the Lord still used His human voice and said, why are “you disturbed and why do thoughts arise into your hearts? See My hands and My feet that it is I myself. Handle Me and see because (or that) a spirit has not bones and flesh, as you see Me have.”
Source: Letters (New Advent)