purgatory (n.)

c. 1200, purgatorie, "place or condition of temporal punishment for spiritual cleansing after death of souls dying penitent and destined ultimately for Heaven," from Old French purgatore, purgatoire and directly from Medieval Latin purgatorium (St. Bernard, early 12c.), in Latin, "means of cleansing," noun use of neuter of purgatorius (adj.) "purging, cleansing," from purgat-, past-participle stem of Latin purgare "to cleanse, purify" (see purge (v.)).

It is not considered as a place of probation ; for the ultimate salvation of those in purgatory is assured, and the impenitent are not received into purgatory. The souls in purgatory are supposed, however, to receive relief through the prayers of the faithful and through the sacrifice of the mass. The common belief in the Latin Church is that the purgatorial suffering is by fire ; the Greek Church, however, does not determine its nature. [Century Dictionary]

The figurative use for "state of mental or emotional suffering, expiation, etc." is from late 14c., originally especially when due to unrequited love, or, (seemingly paradoxically), marriage (e.g. Lydgate's wyfly purgatorye). In old New England it was used of narrow gorges and steep-sided ravines. Related: Purgatorial; purgatorian

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proof (n.)

c. 1200, preove "evidence and argumentation to establish the fact of (something) beyond reasonable doubt," from Anglo-French prove, preove, Old French proeve, prueve "proof, test, experience" (13c., Modern French preuve), from Late Latin proba "a proof," a back-formation from Latin probare "to prove" (see prove). "The devocalization of v to f ensued upon the loss of final e; cf. the relation of v and f in believe, belief, relieve, relief, behove, behoof, etc." [OED].

The meaning "act of proving" is early 14c. The meaning "act of testing or making trial of anything" is from late 14c., from influence of prove. Meaning "standard of strength of distilled liquor" is from 1705, on the notion of "having been tested as to degree of strength." The use in photography is from 1855. The typographical sense of "trial impression to test type" is from c. 1600. The numismatic sense of "coin struck to test a die" is from 1762; now mostly in reference to coins struck from highly polished dies, mainly for collectors.

The adjectival sense "impenetrable, able to resist" (as in proof against) is recorded from 1590s, from the noun in expressions such as proof of (mid-15c.), hence extended senses involving "of tested power against" in compounds such as fireproof (1630s), rust-proof (1690s), waterproof (1725), fool-proof (1902), etc. Shakespeare has shame-proof. Expression the proof is in the pudding (1915) is a curious perversion of earlier proof of the pudding shall be in the eating (1708), with proof in the sense "quality of proving good or turning out well" (17c.).

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right (n.)

Old English riht (West Saxon, Kentish), reht (Anglian), "that which is morally right, duty, obligation," also "rule of conduct; law of a land;" also "what someone deserves; a just claim, what is due, equitable treatment;" also "correctness, truth;" also "a legal entitlement (to possession of property, etc.), a privilege," from Proto-Germanic *rehtan (see right (adj.1)). In Middle English often contrasted to might or wrong. From early 14c. as "a right action, a good deed," hence the right "that which is just or true, righteousness."

From what has been said it will be seen that the adjective right has a much wider signification than the substantive Right. Every thing is right which is conformable to the Supreme Rule of human action ; but that only is a Right which, being conformable to the Supreme Rule, is realized in Society, and vested in a particular person. Hence the two words may often be properly opposed. We may say that a poor man has no Right to relief, but it is right he should have it. A rich man has a Right to destroy the harvest of his fields, but to do so would not be right. [William Whewell, "Elements of Morality," 1858]

The meaning "the right hand or right side" (as opposed to the left) is from mid-13c.; see right (adj.2) for sense development. As "the right wing of an army" by 1707. Political use is from 1825. Meaning "a blow with the right fist" is from 1898; the meaning "a right-hand turn" is by 1961. The phrase to rights "at once, straightway" is 1660s, from an earlier meaning "in a proper manner" (Middle English). Adjectival phrase right-to-work is attested from 1958; right-to-die by 1976. To do or something in one's own right (1610s) is from the legal use for "title or claim to something possessed by one or more" (12c.).

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humor (n.)

mid-14c., "fluid or juice of an animal or plant," from Old North French humour "liquid, dampness; (medical) humor" (Old French humor, umor; Modern French humeur), from Latin umor "body fluid" (also humor, by false association with humus "earth"); related to umere "be wet, moist," and to uvescere "become wet" (see humid).

In old medicine, "any of the four body fluids" (blood, phlegm, choler, and melancholy or black bile).

The human body had four humors—blood, phlegm, yellow bile, and black bile—which, in turn, were associated with particular organs. Blood came from the heart, phlegm from the brain, yellow bile from the liver, and black bile from the spleen. Galen and Avicenna attributed certain elemental qualities to each humor. Blood was hot and moist, like air; phlegm was cold and moist, like water; yellow bile was hot and dry, like fire; and black bile was cold and dry, like earth. In effect, the human body was a microcosm of the larger world. [Robert S. Gottfried, "The Black Death," 1983]

 Their relative proportions were thought to determine physical condition and state of mind. This gave humor an extended sense of "mood, temporary state of mind" (recorded from 1520s); the sense of "amusing quality, funniness, jocular turn of mind" is first recorded 1680s, probably via sense of "whim, caprice" as determined by state of mind (1560s), which also produced the verb sense of "indulge (someone's) fancy or disposition." Modern French has them as doublets: humeur "disposition, mood, whim;" humour "humor." "The pronunciation of the initial h is only of recent date, and is sometimes omitted ..." [OED].

For aid in distinguishing the various devices that tend to be grouped under "humor," this guide, from Henry W. Fowler ["Modern English Usage," 1926] may be of use:

HUMOR: motive/aim: discovery; province: human nature; method/means: observation; audience: the sympathetic
WIT: motive/aim: throwing light; province: words & ideas; method/means: surprise; audience: the intelligent
SATIRE: motive/aim: amendment; province: morals & manners; method/means: accentuation; audience: the self-satisfied
SARCASM: motive/aim: inflicting pain; province: faults & foibles; method/means: inversion; audience: victim & bystander
INVECTIVE: motive/aim: discredit; province: misconduct; method/means: direct statement; audience: the public
IRONY: motive/aim: exclusiveness; province: statement of facts; method/means: mystification; audience: an inner circle
CYNICISM: motive/aim: self-justification; province: morals; method/means: exposure of nakedness; audience: the respectable
SARDONIC: motive/aim: self-relief; province: adversity; method/means: pessimism; audience: the self
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