“All passions that suffer themselves to be relished and digested are but moderate.”
Book I, Ch. 2. Of Sorrow
Essais (1595), Bartlett's Familiar Quotations, 10th ed. (1919)
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Michel De Montaigne 264
(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592Related quotes

“754. Absence cools moderate Passions, but inflames violent ones.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“When the sword is once drawn, the passions of men observe no bounds of moderation.”
No. 16 http://www.constitution.org/fed/federa16.htm : The Insufficiency of the Present Confederation to Preserve the Union
The Federalist Papers (1787–1788)
Context: When the sword is once drawn, the passions of men observe no bounds of moderation. The suggestions of wounded pride, the instigations of irritated resentment, would be apt to carry the States against which the arms of the Union were exerted, to any extremes necessary to avenge the affront or to avoid the disgrace of submission. The first war of this kind would probably terminate in a dissolution of the Union.

Original: Nella vita, chiunque subisca sofferenze, in cui venga coinvolto lo stato psichico, ha bisogno di aiuto e rispetto: siate gentili, delicati e moderati.
Source: prevale.net

“Passion is like suffering, and like suffering it creates its object.”
The Tragic Sense of Life (1913), XI : The Practical Problem
Context: Passion is like suffering, and like suffering it creates its object. It is easier for the fire to find something to burn than for something combustible to find the fire.

"To the Countess of Essex, Upon Her Grief occasioned by the loss of Her only Daughter" (29 January 1674), in Miscellanea (4th ed. pub. 1705), p. 172.
Variant: "Christianity teaches us to moderate our passions; to temper our affections toward all things below; to be thankful for the possession, and patient under loss, whenever He who gave shall see fit to take away." Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 140.

Source: On the Mystical Body of Christ, pp. 424-425
Context: What does the Scripture mean when it tells us of the body of one man so extended in space that all can kill him? We must understand these words of ourselves, of our Church, or the body of Christ. For Jesus Christ is one man, having a Head and a body. The Saviour of the body and the members of the body are two in one flesh, and in one voice, and in one passion, and, when iniquity shall have passed away, in one repose.
And so the passion of Christ is not in Christ alone; and yet the passion of Christ is in Christ alone. For if in Christ you consider both the Head and the body, the Christ’s passion is in Christ alone; but if by Christ you mean only the Head, then Christ’s passion is not in Christ alone. Hence if you are in the members of Christ, all you who hear me, and even you who hear me not (though you do hear, if you are united with the members of Christ), whatever you suffer at the hands of those who are no among the members of Christ, was lacking to the sufferings of Christ. It is added precisely because it was lacking. You fill up the measure; you do not cause it to overflow. You will suffer just so much as must be added of your sufferings to the complete passion of Christ, who suffered as our Head and who continues to suffer in His members, that is, in us. Into this common treasury each pays what he owes, and according to each one’s ability we all contribute our share of suffering. The full measure of the Passion will not be attained until the end of the world.