19 Now since we are conscious of the truth of all this, let us set ourselves free from chastisement and vengeance; and let us show our reverence for the present feast, by doing all that has been said; and those same favours which we think to obtain from the Emperor on account of the feast, let us ourselves enable others to enjoy. For I hear, indeed, many saying, that the Emperor, out of his reverence for the Holy Passover, will be reconciled to the city and will pardon all its offenses.
How absurd then is it, that when we have to depend for our safety upon others, we bring forward the feast, and its claims; but that when we are commanded to be reconciled one with another, we treat this same feast with disdain, and think nothing of it. No one, truly, so pollutes this holy feast, as he does, who, while he is keeping it, cherishes malignity. Or rather, I might say, that such a person cannot possibly keep it, though he should remain without food ten days successively.
For where there is enmity and strife, there can be neither fast nor festival. You would not dare to touch the holy Sacrifice with unwashed hands, however pressing the necessity might be. Approach not then with an unwashed soul! For this is far worse than the other and brings a heavier punishment. For nothing so fills the mind with impurity, as anger remaining constantly within it. The spirit of meekness settles not where wrath or passion exists; and when a man is destitute of the Holy Spirit, what hope of salvation shall he have, and how shall he walk aright?
Do not then, O beloved, while you are desirous to be revenged of your enemy, cast yourself down headlong; nor cause yourself to be left alone without the guardianship of God! For, in truth, if the duty were a difficult one, yet the greatness of the punishment, which results from this action of disobedience, were sufficient to arouse the most slothful and supine, and to persuade them to undergo every degree of labour. But now our argument has shown that the duty is most easy, if we are willing.
Source: Homilies on the Statues (New Advent)