Quotes about people
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“I can calculate the motions of the heavenly bodies, but not the madness of the people.”
Such a statement is indicated as his response to a question regarding the financial fiasco known as the South Sea Bubble; the earliest mention of this famous anecdote appears to be from manuscripts of the Second Memorandum Book (1756) of Joseph Spence, first published in Anecdotes, Observations, and Characters, of Books and Men (1820) https://archive.org/details/anecdotesobserv00singgoog edited by in Samuel Weller Singer; a Lord Radnor is quoted as saying:
When Sir Isaac Newton was asked about the continuance of the rising of South Sea stock? — He answered, "that he could not calculate the madness of the people."
Variants:
I can calculate the motions of erratic bodies, but not the madness of a multitude.
As quoted in "Mammon and the Money Market", in The Church of England Quarterly Review (1850), p. 142 http://books.google.com/books?id=s_cDAAAAQAAJ&pg=PA142&dq=%22but+not+the+madness%22&hl=en&ei=nUtbTfuoCYG6ugPFi4n4DA&sa=X&oi=book_result&ct=book-preview-link&resnum=1&ved=0CCkQuwUwAA#v=onepage&q=%22but%20not%20the%20madness%22&f=false
I can calculate the motions of the heavenly bodies, but not the madness of people.
I can calculate the motions of heavenly bodies but not the madness of men.
I can calculate the movement of the stars, but not the madness of men.
Disputed

“There is nothing so annoying as having two people talking when you're busy interrupting.”

Source: Alice's Adventures In Wonderland And Through The Looking Glass

“Do you wish people to think well of you? Don't speak well of yourself.”

“Other people are quite dreadful. The only possible society is oneself.”
Lord Goring, Act III.
Variant: The only possible society is oneself.
Source: An Ideal Husband (1895)

“Tis better people think you a fool, then open your mouth and erase all doubt.”
Variously attributed to Lincoln, Elbert Hubbard, Mark Twain, Benjamin Franklin and Socrates
Misattributed
Variant: It is better to be silent and be thought a fool than to speak and remove all doubt.

“It's not me who can't keep a secret. It's the people I tell that can't.”

“The things most people want to know about are usually none of their business.”

Source: Everything Belongs: The Gift of Contemplative Prayer

“Ah, how good it is to be among people who are reading.”
Source: The Notebooks of Malte Laurids Brigge

“People's whole lives do pass in front of their eye before dying. The process is called "Living”

No estoy seguro de que yo exista, en realidad. Soy todos los autores que he leído, toda la gente que he conocido, todas las mujeres que he amado. Todas las ciudades que he visitado, todos mis antepasados...
Source: El Pais, 1981 http://elpais.com/diario/1981/09/26/ultima/370303206_850215.html; translation: The Guardian, 2008 http://www.theguardian.com/books/2008/jun/10/jorgeluisborges

Source: The Unabridged Journals of Sylvia Plath

Source: Propaganda and the Public Mind: Conversations with Noam Chomsky and David Barsamian

“When red-headed people are above a certain social grade their hair is auburn.”

“People who see life as anything more than pure entertainment are missing the point.”
Books, When Will Jesus Bring the Pork Chops? (2004)
Source: When Will Jesus Bring The Pork Chops?

“It is so difficult – at least, I find it difficult – to understand people who speak the truth.”
Source: A Room with a View (1908), Ch.1

Source: The Bus Driver Who Wanted to be God & Other Stories


“Few people can be happy unless they hate some other person, nation, or creed.”
Attributed to Russell in Prochnow's Speakers Handbook of Epigrams and Witticisms (1955), p. 132
Disputed

“Clothes make the man. Naked people have little or no influence on society.”
More Maxims of Mark (1927) edited by Merle Johnson
Variant: Clothes make the man. Naked people have little or no influence on society.

“People say that you're going the wrong way when it's simply a way of your own.”

From a personal conversation, quoted from memory by Maxim Gorky in "V.I. Lenin" (1924) http://www.marxists.org/archive/gorky-maxim/1924/01/x01.htm <!-- first edition -->
Attributions
Context: I know of nothing better than the Appassionata and could listen to it every day. What astonishing, superhuman music! It always makes me proud, perhaps with a childish naiveté, to think that people can work such miracles! … But I can’t listen to music very often, it affects my nerves. I want to say sweet, silly things, and pat the little heads of people who, living in a filthy hell, can create such beauty. These days, one can’t pat anyone on the head nowadays, they might bite your hand off. Hence, you have to beat people's little heads, beat mercilessly, although ideally we are against doing any violence to people. Hm — what a devillishly difficult job!

“People always ask me how long it takes to do my hair. I don’t know, I’m never there.”

Source: Tribe: On Homecoming and Belonging

“Some people have a large circle of friends while others have only friends that they like.”

Source: My Name is Red

“Surround yourself only with people who are going to take you higher.”
Source: en.wikiquote.org - Oprah Winfrey / Quotes / CNN interview (2011)

“In the face of impossible odds, people who love this country can change it.”

Contribution to the Critique of Hegel's Philosophy of Right, Introduction..., p. 1 (1843).
Context: Religious suffering is, at one and the same time, the expression of real suffering and a protest against real suffering. Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people.
The abolition of religion as the illusory happiness of the people is the demand for their real happiness. To call on them to give up their illusions about their condition is to call on them to give up a condition that requires illusions. The criticism of religion is, therefore, in embryo, the criticism of that vale of tears of which religion is the halo.
Criticism has plucked the imaginary flowers on the chain not in order that man shall continue to bear that chain without fantasy or consolation, but so that he shall throw off the chain and pluck the living flower.

Source: Hell's Angels: A Strange and Terrible Saga


“Conquered people tend to be witty.”
Mr. Sammler's planet, (1976), p. 98
General sources

“Nanny Ogg never did any housework herself, but she was the cause of housework in other people.”

“Whenever the cause of the people is entrusted to professors, it is lost.”

Source: Unpopular Essays

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

“When people are finding meaning in things -- beware.”
Source: Ascending Peculiarity: Edward Gorey on Edward Gorey

“When people are laughing, they're generally not killing one another.”

A Tramp Abroad (1880)
Context: You may say a cat uses good grammar. Well, a cat does -- but you let a cat get excited once; you let a cat get to pulling fur with another cat on a shed, nights, and you'll hear grammar that will give you the lockjaw. Ignorant people think it's the noise which fighting cats make that is so aggravating, but it ain't so; it's the sickening grammar they use.