Definitions

As with all of these things, I like to start with the word definitions to find out what we are dealing with:

world (n.)
Old English woruld, worold “human existence, the affairs of life,” also “a long period of time,” also “the human race, mankind, humanity,” a word peculiar to Germanic languages (cognates: Old Saxon werold, Old Frisian warld, Dutch wereld, Old Norse verold, Old High German weralt, German Welt), with a literal sense of “age of man,” from Proto-Germanic *weraldi-, a compound of *wer “man” (Old English wer, still in werewolf; see virile) + *ald “age” (from PIE root *al- (2) “to grow, nourish”).

Originally “life on earth, this world (as opposed to the afterlife),”

That definition makes sense, its not the Earth, the soil, (it is a different word for a start) world means human affairs.

affair (n.)

c. 1300, afere, “what one has to do, ordinary business,” from Anglo-French afere, Old French afaire “business, event; rank, estate” (12c., Modern French affaire), from the infinitive phrase à faire “to do,” from Latin ad “to” (see ad-) + facere “to do, make” (from PIE root *dhe- “to set, put”).

rank (n.)

early 14c., “row, line, or series;” c. 1400, a row of an army, from Old French renc, ranc “row, line” (Modern French rang), from Frankish *hring or some other Germanic source (compare Old High German hring “circle, ring”), from Proto-Germanic *hringaz “circle, ring, something curved” (from nasalized form of PIE root *sker- (2) “to turn, bend”).

Meaning “a social division, class of persons” is from early 15c. Meaning “high status or position in society” is from early 15c. Meaning “a relative position” is from c. 1600

estate (n.)

early 13c., “rank, standing, condition,” from Anglo-French astat, Old French estat “state, position, condition, health, status, legal estate” (13c., Modern French état), from Latin status “state or condition, position, place; social position of the aristocracy,” from PIE root *sta- “to stand, make or be firm.”

For the unetymological e-, see e-. Sense of “property” is late 14c., from that of “worldly prosperity;” specific application to “landed property” (usually of large extent) is first recorded in American English 1620s. A native word for this was Middle English ethel (Old English æðel) “ancestral land or estate, patrimony.” Meaning “collective assets of a dead person or debtor” is from 1830. The three estates (in Sweden and Aragon, four) conceived as orders in the body politic date from late 14c. In France, they are the clergy, nobles, and townsmen; in England, originally the clergy, barons, and commons, later Lords Spiritual, Lords Temporal, and commons.

policy (n.1)

[“way of management”], late 14c., policie, “study or practice of government; good government;” from Old French policie (14c.) “political organization, civil administration,” from Late Latin politia “the state, civil administration,” from Greek politeia “state, administration, government, citizenship,” from politēs “citizen,” from polis “city, state” (see polis). From early 15c. as “an organized state, organized or established system of government or administration of a state,” but this sense has gone with polity. Also from early 15c. as “object or course of conduct, or the principles to be observed in conduct,” and thus “prudence or wisdom in action” generally, but especially “the system of measures or the line of conduct which a ruler, minister, government, or party adopts as best for the interests of the country in domestic or foreign affairs.”

civil (adj.)

late 14c., “relating to civil law or life; pertaining to the internal affairs of a state,” from Old French civil “civil, relating to civil law” (13c.) and directly from Latin civilis “relating to a society, pertaining to public life, relating to the civic order, befitting a citizen,” hence by extension “popular, affable, courteous;” alternative adjectival derivative of civis “townsman” (see city).

Meaning “not barbarous, civilized” is from 1550s. Specifically “relating to the commonwealth as secularly organized” (as opposed to military or ecclesiastical) by 1610s. Meaning “relating to the citizen in his relation to the commonwealth or to fellow citizens” also is from 1610s.

secular (adj.)

c. 1300, seculer, in reference to clergy, “living in the world, not belonging to a religious order,” also generally, “belonging to the state” (as opposed to the Church), from Old French seculer, seculare (Modern French séculier) and directly from Late Latin saecularis “worldly, secular, pertaining to a generation or age,” in classical Latin “of or belonging to an age, occurring once in an age,” from saeculum “age, span of time, lifetime, generation, breed.”This is from Proto-Italic *sai-tlo-, which, according to Watkins, is PIE instrumental element *-tlo- + *sai- “to bind, tie” (see sinew), extended metaphorically to successive human generations as links in the chain of life. De Vaan also connects it with “bind” words and lists as a cognate Welsh hoedl “lifespan, age.” An older theory connected it to words for “seed,” from PIE root *se- “to sow” (see sow (v.), and compare Gothic mana-seþs “mankind, world,” literally “seed of men”). The ancient Roman ludi saeculares was a three-day, day-and-night celebration coming once in an “age” (120 years).  Ecclesiastical writers in Latin used it as those in Greek did aiōn “of this world” (see cosmos). It is the source of French siècle “century.” The meaning “of or belonging to an age or a long period,” especially occurring once in a century, was in English from 1590s. From mid-14c. in the general sense of “of or belonging to the world, concerned in earthly more than in spiritual, life;” also of literature, music, etc., “not overtly religious.” In English, in reference to humanism and the exclusion of belief in God from matters of ethics and morality, from 1850s. Related: Secularly.

harm (v.)

Old English hearmian “to hurt, injure,” from the noun (see harm (n.)). It has ousted Old English skeþþan (see scathe (v.)) in all but a few senses. Related: Harmed; harming.

injury (n.)

late 14c., “harm, damage, loss; a specific injury,” from Anglo-French injurie “wrongful action” (Old French injure, 13c.), from Latin iniuria “wrong, an injustice, insult, unlawful violence, assault, damage, harm,” noun use of fem. of iniurius “wrongful, unjust, unlawful,” from in- “not, opposite of” (see in- (1)) + ius (genitive iuris) “right, law” (see jurist).