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civility costs nothing

It is easy to be respectful. You don't have to be their best friends, but you could at least say hi to them—civility costs nothing.
See also: cost, nothing

Civility costs nothing.

 and Courtesy costs nothing.
Prov. It never hurts you to be polite. Always greet people politely, no matter what you think of them. Civility costs nothing. Why not write Mildred a thank-you note? Courtesy costs nothing.
See also: cost, nothing

out of courtesy (to someone)

in order to be polite to someone; out of consideration for someone. We invited Mary's brother out of courtesy to her. They invited me out of courtesy.
See also: courtesy, of, out

courtesy of somebody/something

1 (also by courtesy of somebody/something) with the official permission of somebody/something and as a favour: The pictures have been reproduced by courtesy of the British Museum.
2 given as a prize or provided free by a person or an organization: Win a weekend in Rome, courtesy of Fiat.
3 as the result of a particular thing or situation: Viewers can see the stadium from the air, courtesy of a camera fastened to the plane.

do somebody the courtesy of doing something

be polite by doing the thing that is mentioned: Please do me the courtesy of listening to what I’m saying.

have the courtesy to do something

know when you should do something in order to be polite: You think he’d at least have the courtesy to call to say he’d be late.
See also: courtesy, have, something
References in classic literature ?
The distressed damsel strove with much pertinacity to kiss his hands; but Don Quixote, who was in all things a polished and courteous knight, would by no means allow it, but made her rise and embraced her with great courtesy and politeness, and ordered Sancho to look to Rocinante's girths, and to arm him without a moment's delay.
Your worship is mistaken, senor," said she; "for it is not two years since I set out from it, and though I never had good weather, nevertheless I am here to behold what I so longed for, and that is my lord Don Quixote of La Mancha, whose fame came to my ears as soon as I set foot in Spain and impelled me to go in search of him, to commend myself to his courtesy, and entrust the justice of my cause to the might of his invincible arm.
After a few potations, the waggish pair persuaded the exhilarated Frenchman that there was an inexcusable partiality in offering to one lady, and not extending a similar courtesy to another.
On the trail that thou must tread To the thresholds of our dread, Where the Flower blossoms red; Through the nights when thou shalt lie Prisoned from our Mother-sky, Hearing us, thy loves, go by; In the dawns when thou shalt wake To the toil thou canst not break, Heartsick for the Jungle's sake: Wood and Water, Wind and Tree, Wisdom, Strength, and Courtesy, Jungle-Favour go with thee!
My gentleman gives the law where he is; he will outpray saints in chapel, outgeneral veterans in the field, and outshine all courtesy in the hall.
No rentroll nor army-list can dignify skulking and dissimulation; and the first point of courtesy must always be truth, as really all the forms of good-breeding point that way.
The flower of courtesy does not very well bide handling, but if we dare to open another leaf and explore what parts go to its conformation, we shall find also an intellectual quality.
But I will neither be driven from some allowance to Fashion as a symbolic institution, nor from the belief that love is the basis of courtesy.
If the individuals who compose the purest circles of aristocracy in Europe, the guarded blood of centuries, should pass in review, in such manner as that we could at leisure and critically inspect their behavior, we might find no gentleman and no lady; for although excellent specimens of courtesy and high-breeding would gratify us in the assemblage, in the particulars we should detect offence.
Everything that is called fashion and courtesy humbles itself before the cause and fountain of honor, creator of titles and dignities, namely the heart of love.
I didn't say a word, but with extreme courtesy, I may say with most refined courtesy, I reached my finger and thumb over towards the poodle, took it up delicately by the nape of the neck, and chucked it out of the window, after the cigar.
While he was arguing with the boy in the inn-yard, a person came up to him, and saluting him by his name, enquired how all the good family did in Somersetshire; and now Jones casting his eyes upon this person, presently discovered him to be Mr Dowling, the lawyer, with whom he had dined at Gloucester, and with much courtesy returned the salutation.
Chandler assisted her to her feet with instant and solicitous courtesy.
He behaved with hostile courtesy, as though he were afraid of coming closer to people he did not respect.
Winners of getaway trips to Puerto Vallarta will also receive a choice of 2 activities courtesy of Vallarta Adventures and Dolphin Discovery.