“All mankind, right down to those you most despise, are your neighbors.”

Jacula Prudentum (1651)

Source: The Ordeal of Change (1963), Ch. 11: "Brotherhood"
Context: It is easier to love humanity as a whole than to love one's neighbor. There may even be a certain antagonism between love of humanity and love of neighbor; a low capacity for getting along with those near us often goes hand in hand with a high receptivity to the idea of the brotherhood of men. About a hundred years ago a Russian landowner by the name of Petrashevsky recorded a remarkable conclusion: "Finding nothing worthy of my attachment either among women or among men, I have vowed myself to the service of mankind." He became a follower of Fourier, and installed a phalanstery on his estate. The end of the experiment was sad, but what one might perhaps have expected: the peasants — Petrashevsky's neighbors-burned the phalanstery.
Some of the worst tyrannies of our day genuinely are "vowed" to the service of mankind, yet can function only by pitting neighbor against neighbor. The all-seeing eye of a totalitarian regime is usually the watchful eye of the next-door neighbor. In a Communist state love of neighbor may be classed as counter-revolutionary.

Dostoyevsky, in a letter to Katkov, the reactionary editor of The Moscow Herald, in which The Brothers Karamazov was serialized
As quoted by David Magarshack in his 1958 translation of The Brothers Karamazov
Context: The modern negationist declares himself declares himself openly in favour of the devil's advice and maintains that it is more likely to result in man's happiness than the teachings of Christ. To our foolish but terrible Russian socialism (for our youth is mixed up in it) it is a directive and, it seems, a very powerful one: the loaves of bread, the Tower of Babel (that is, the future reign of socialism) and the complete enslavement of the freedom of conscience - that is what the desperate negationist is striving to achieve. The difference is, that our socialists (and they are not only the hole-and-corner nihilists) are conscious Jesuits and liars who do not admit that their ideal is the ideal of the coercion of the human conscience and the reduction of mankind to the level of cattle. While my socialist (Ivan Karamazov) is a sincere man who frankly admits that he agrees with the views of the Grand Inquisitor and that Christianity seems to have raised man much higher than his actual position entitles him. The question I should like to put to them is, in a nutshell, this: "Do you despise or do you respect mankind, you - its future saviours?"

Book III, Ch. 13
Attributed
Variant: Of all the infirmities we have, 'tis the most savage to despise our being. (Charles Cotton translation)

Kinsey Millhone
"A" Is for Alibi (1982)

The Rights of the World Citizen (1942); a revised edition of The Rights of Man

Letter to Edward Newenham (20 October 1792) http://etext.lib.virginia.edu/etcbin/toccer-new2?id=WasFi32.xml&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=155&division=div1, these statements and one from a previous letter to Newenham seem to have become combined and altered into a misquotation of Washington's original statements to read:
1790s
Context: Of all the animosities which have existed among mankind, those which are caused by difference of sentiments in religion appear to be the most inveterate and distressing, and ought most to be deprecated. I was in hopes that the enlightened and liberal policy, which has marked the present age, would at least have reconciled Christians of every denomination so far that we should never again see the religious disputes carried to such a pitch as to endanger the peace of society.

Hotchkiss
1900s, Getting Married (1908)
Context: Religion is a great force — the only real motive force in the world; but what you fellows don't understand is that you must get at a man through his own religion and not through yours. Instead of facing that fact, you persist in trying to convert all men to your own little sect, so that you can use it against them afterwards. You are all missionaries and proselytizers trying to uproot the native religion from your neighbor's flowerbeds and plant your own in its place. You would rather let a child perish in ignorance than have it taught by a rival sectary. You can talk to me of the quintessential equality of coal merchants and British officers; and yet you can't see the quintessential equality of all the religions.

Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, 100 Things Successful People Do: Little Exercises for Successful Living (2016) https://books.google.ae/books?idnu0lCwAAQBAJ&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIMjAE