Customs (archaically known as usages) also known as mores, conventions, and norms, are a set of agreed, stipulated or generally accepted social rules, standards or criteria established by common practice and socially enforced. These include the observance of traditions, and customary laws recognized by courts.
Hoyt's New Cyclopedia Of Practical Quotations 
- Quotes reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 154-55.
- Consuetudo est secunda natura.
- Custom is second nature.
- St. Augustine.
- Vetus consuetudo natunæ vim obtinet.
- An ancient custom obtains force of nature.
- Cicero, De Inventione.
- Only that he may conform
To (Tyrant) customs.
- Guillaume de Salluste Du Bartas, Divine Weekes and Workes, Second Week (1584), Third Day, Part II.
- Such dupes are men to custom, and so prone
To rev'rence what is ancient, and can plead
A course of long observance for its use,
That even servitude, the worst of ills,
Because deliver'd down from sire to son,
Is kept and guarded as a sacred thing!
- William Cowper, The Task (1785), Book V, line 298.
- The slaves of custom and established mode,
With pack-horse constancy we keep the road
Crooked or straight, through quags or thorny dells,
True to the jingling of our leader's bells.
- William Cowper, Tirocinium, line 251.
- Man yields to custom, as he bows to fate,
In all things ruled—mind, body, and estate;
In pain, in sickness, we for cure apply
To them we know not, and we know not why.
- George Crabbe, Tale III, The Gentleman Farmer, line 86.
- Che l'uso dei mortali è come fronda.
In ramo, che sen va, ed altra viene.
- The customs and fashions of men change like leaves on the bough, some of which go and others come.
- Dante Alighieri, Paradiso, XXVI. 137.
- Great things astonish us, and small dishearten us. Custom makes both familiar.
- Jean de La Bruyère, The Characters or Manners of the Present Age (1688), Volume II, Chapter I. On Judgments.
- Consuetudo pro lege servatur.
- Custom is held to be as a law.
- Law Maxim.
- Optimus legum interpres consuetudo.
- Custom is the best interpreter of laws.
- Law Maxim.
- Vetustas pro lege semper habetur.
- Ancient custom is always held or regarded as law.
- Law Maxim.
- The laws of conscience, which we pretend to be derived from nature, proceed from custom.
- Michel de Montaigne, Of Custom and Law, Chapter XXII.
- Choose always the way that seems the best, however rough it may be. Custom will render it easy and agreeable.
- Pythagoras, Ethical Sentences from Stobæus.
- Nicht fremder Brauch gedeiht in einem Lande.
- Strange customs do not thrive in foreign soil.
- Friedrich Schiller, Demetrius, I. 1.
- Ein tiefer Sinn wohnt in den alten Bräuchen.
- A deep meaning often lies in old customs.
- Friedrich Schiller, Marie Stuart, I. 7. 131.
- Custom calls me to 't:
What custom wills, in all things should we do't,
The dust on antique time would lie unswept,
And mountainous error be too highly heap't
For truth to o'erpeer.
- But to my mind, though I am native here,
And to the manner born, it is a custom
More honor'd in the breach than the observance.
- That monster, custom, * * * is angel yet in this,
That to the use of actions fair and good
He likewise gives a frock or livery,
That aptly is put on.
- Nice customs curtesy to great kings.
- New customs,
Though they be never so ridiculous,
Nay, let 'em be unmanly, yet are followed.
- The tyrant custom, most grave senators,
Hath made the flinty and steel couch of war
My thrice-driven bed of down.
- 'Tis nothing when you are used to it.
- Jonathan Swift, Polite Conversation, Dialogue III.
- The old order changeth, yielding place to new;
And God fulfils himself in many ways,
Lest one good custom should corrupt the world.
- Alfred Tennyson, Passing of Arthur, line 408. First line also in Coming of Arthur, line 508.
The Dictionary of Legal Quotations (1904) 
- Quotes reported in James William Norton-Kyshe, The Dictionary of Legal Quotations (1904), p. 242-244.
- No degree of antiquity can give sanction to a usage bad in itself.
- Lord Mansfield, Case of John Money and others (1765), 19 How. St. Tr. 1027.
- Rights of every kind, which stand upon the foot of usage, gradually receive new strength in point of light and evidence from the continuance of that usage; as it implieth the tacit consent and approbation of every successive age, in which the usage hath prevailed. But when the prerogative hath not only this tacit approbation of all ages, the present as well as the former on its side, but is recognised, or evidently presupposed, by many Acts of Parliament, I see no legal objection that can be made to it.
- Foster, J., Case of Alexander Broadfoot (1742), Foster's Rep. 179.
- Private customs, indeed, are still to be sought from private tradition.
- Camden, J., Case of Seizure of Papers (1765), 19 How. St. Tr. 1068.
- Proof of the usage of a large capital such as London, is sufficient to show that of the whole world unless it is contradicted.
- Kekeuoich, J., Williams v. Colonial Bank (1887), L. R. 36 C. D. 670.
- The custom of the city of London is a matter of fact.
- Denison, J., Rex v. Davis (1758), 1 Burr. Part IV. 641.
- We shall go according to the constant usage within memory.
- Jefferies, C.J., Sacheverell's Case (1684), 10 How. St. Tr. 72.
- You say it was in the Saxons' time; you do not come to any time within 600 years; you speak of those times wherein things were obscure.
- Lord Bridgman, C.B., Scot's Case (1660), 5 How. St. Tr. 1066.
- In many cases a party undertakes to prove a custom from the time of legal memory, the reign of Richard the Second; but that proof is generally established by evidence of acts done at a much later period, and frequently no evidence is given beyond the present century.
- Lord Kenyon, C.J., Withnell v. Gartham (1795), 6 T. R. 397.
- There can be very few cases, where a custom has been sufficiently proved, in which a Court could hold that it was unreasonable, for that it must be convenient is shown by the fact that it has been established and followed.
- Channell, J., Moult v. Halliday (1897), L. R. 1 Q. B. D. 130.
- I cannot draw a distinction as to what length of time will render a practice legal.
- Dallas, C.J., Butt v. Conant (1828), Gow's Rep. 95.
- I know not how or where to ascertain when an usage becomes of age.
- Dallas, C.J., Keyser v. Suse (1828), Gow's Rep. 65.
- As usage is a good interpreter of the laws, so non-usage, where there is no example, is a great intendment that the law will not bear it.
- Lord Littleton, Section 180, Co. Litt, p. 31.
- Time whereof the memory of man runneth not to the contrary.
- Black's Commentaries, Book 1,. sec 3, p. 15.
- If the custom be general, it is the law of the realm: if local only, it is lex loci, the law of the place. Now, all laws are general, as far as the law extends; and all customs of England are of course, immemorial.1 No usage, therefore, can be part of that law, or have the force of a custom, that is not immemorial.
- Yates, J., Millar v. Taylor (1769), 4 Burr. Part IV. 2368.
- Whatever may be the effect of the prevailing fashions of the times, I do not think that the argument of inconvenience, arising out of those fashions, can at any time be relied upon against a current of decisions.
- Lord Eldon, C.J., Beard v. Webb (1800), Bos. & Pull. Rep. 109.
- All customs must be supposed to have had a good commencement, unless they appear to be inconsistent or against reason.
- Per Cur., Burton v. Wileday (1737), Andrews' Rep. 39.
- Customs which are consistent may be pleaded against each other.
- Buller, J., Ball v. Herbert (1789), 3 T. R. 264.
- Modus et conventio vineunt legem: Custom and agreement overrule law.
- 2 Co. 73.