Hidden Anger

Quid vero dicam de his (quod quidem dicere sine mea confusione non possum) quorum implacabilitati nec hic quidem sol occidens terminum ponit; sed per dies eam plurimos protelantes, atque adversus eos in quos commoti fuerint rancorem animi reservantes, negant quidem se verbis irasci, sed reipsa et opere indignari gravissime comprobantur? Nam neque eos congruo sermone compellant, nec affabilitate eis solita colloquuntur; et in eo se minime delinquere putant, quod vindictam suae commotionis non expetant; quam tamen quia proferre palam et exercere, aut non audent, aut certe non possunt, in suam perniciem virus iracundiae retorquentes, concoquunt eam in corde taciti, ac silentes in semetipsis consumunt, amaritudinem tristitiae non virtute animi protinus expellentes, sed digerentes processu dierum, et utcumque pro tempore mitigantes. Sanctus Ioannes Cassianus, De Coenobiorum Institutis, Lib VIII Cap XI, De Spiritu Irae Source: Migne PL 49.341a-b

But what am I to say, which indeed I cannot say without shame on my own part, of those to whose implacability even the going down of the sun brings no end, 1 but they prolong it for numerous days, and against those who have troubled them they preserve rancor, denying in words that they are angry, but in truth and deed showing that they are most resentful? For they do not address them suitably, nor converse with them affably, and in this they do not think that they do any wrong since they do not seek venegance for their distress. However, because they do not show their anger openly or exercise it, since they do not dare, or are not able, they twist back the poison of anger into themselves to their own ruin, and secretly nuture it in their hearts, and silently feast on it in themselves, not casting off the bitterness of their upset by the virtue of the soul, but smoothing it out as the days pass, and somewhat softening it after a time. Saint John Cassian, The Institutes of the Coenobia, Book 8, Chap 11, On Anger 1 Ephes 4.26