But, if there are any who say that, if any one shall have anathematised anything under compulsion of necessity, he is not held by the bond of the anathema, these are themselves witnesses that they are no Christians. For they think by vain attempts to loose the binding of holy Church, and hereby neither do they account as real the absolution of holy Church which she offers to the faithful, if they think that her binding is of no avail. Against such as these dispute should be no longer held, since they ought to be altogether scorned and anathematised; and whence they think to elude the truth, thence let them in reality be bound in their sins.
If, then, there are any who under the Christian name dare either to preach, or to hold silently in their own minds, the points of error which we have spoken of above, these undoubtedly we both have anathematised and do anathematise. Yet, as I have said before, in those who used to come to me in the royal city I observed no error at all as to any one of the aforesaid points, nor do I think there was any. For, if there had been, I should have observed it. However, since there are many of the faithful who are inflamed with unwise zeal, and often, while they attack certain persons as though they were heretics, themselves make heresies, consideration should be had for their infirmity, and, as I have said before, they should be appeased with reason and gentleness. For indeed they are like those of whom it is written, I bear them record, that they have a zeal of God, but not according to knowledge. Wherefore your Excellency, who live incessantly in reading, in tears, and in alms, should, as I have requested, appease their unwisdom by gentle exhortations and replies, that not only in yourself, but also in them, you may find the glory of eternal retribution. All this my exceeding love has induced me to say to you, since I think that your joy is my gain, and your sadness my loss. May Almighty God guard you with heavenly grace, and, keeping safe the Piety of our lord and the Tranquillity of our most pious lady, prolong your life for the education of the little lords.
Source: Register of Letters (New Advent)