“If we were always conscious of the fact that people precious to us are frighteningly mortal, hanging not even by a thread, but by a wisp of gossamer, perhaps we would be kinder to them and more grateful for the love and friendship they give to us.”

Source: Something Blue

A variant of the above misquote, sometimes also attributed to Lenin. This gained popularity during the glasnost era when black market activity was at its most visible in the USSR; meant to show the profit motive was human nature and cannot be eradicated.
Misattributed

Sejamos simples e calmos,
Como os regatos e as árvores,
E Deus amar-nos-á fazendo de nós
Belos como as árvores e os regatos,
E dar-nos-á verdor na sua primavera,
E um rio aonde ir ter quando acabemos...
E não nos dará mais nada, porque dar-nos mais seria tirar-nos mais.
Alberto Caeiro (heteronym), O Guardador de Rebanhos ("The Keeper of Sheep"), VI — in A Little Larger Than the Entire Universe, trans. Richard Zenith (Penguin, 2006)

As quoted in NEA Journal : The Journal of the National Education Association‎ Vol. 41 (1952) p. 300
Context: One of the basic causes for all the trouble in the world today is that people talk too much and think too little. They act too impulsively without thinking. I am not advocating in the slightest that we become mutes with our voices stilled because of fear of criticism of what we might say. That is moral cowardice. And moral cowardice that keeps us from speaking our minds is as dangerous to this country as irresponsible talk. The right way is not always the popular and easy way. Standing for right when it is unpopular is a true test of moral character. The importance of individual thinking to the preservation of our democracy and our freedom cannot be overemphasized. The broader sense of the concept of your role in the defense of democracy is that of the citizen doing his most for the preservation of democracy and peace by independent thinking, making that thinking articulate by translating it into action at the ballot boxes, in the forums, and in everyday life, and being constructive and positive in that thinking and articulation. The most precious thing that democracy gives to us is freedom. You and I cannot escape the fact that the ultimate responsibility for freedom is personal. Our freedoms today are not so much in danger because people are consciously trying to take them away from us as they are in danger because we forget to use them. Freedom unexercised may be freedom forfeited. The preservation of freedom is in the hands of the people themselves — not of the government.

Arthur's commentary
The Nemesis of Faith (1849)

Source: River Marked

Original: Impariamo ad essere grati alla vita. Ogni giorno ci offre l'opportunità di imparare qualcosa di nuovo.
Source: prevale.net

Source: A Soldier Reports (1976), p. 19.
Context: Russians and vodka, I soon learned, were virtually synonymous. Twice I accompanied my division commander, General Craig, with his Russian opposite beyond the Elbe. Since General Craig was an abstainer, his aides had to exercise considerable ingenuity to dispose of the vodka from his glass in nearby flower pots. The Russian general several times did the same. I noted an unwavering peculiarity about the Russians: we always had to go to them; never would they come to visit us or even meet us halfway.

Source: The Historian (2005), Ch. 32
Context: It is a fact that we historians are interested in what is partly a reflection of ourselves, perhaps a part of ourselves we would rather not examine except through the medium of scholarship; it is also true that as we steep ourselves in our interests, they become more and more a part of us. Visiting an American university — not mine — several years after this, I was introduced to one of the first of the great American historians of Nazi Germany. He lived in a comfortable house at the edge of the campus, where he collected not only books on his topic but also the official china of the Third Reich. His dogs, two enormous German shepherds, patrolled the front yard day and night. Over drinks with other faculty members in his living room, he told me in no uncertain terms how he despised Hitler’s crimes and wanted to expose them in the greatest possible detail to the civilized world. I left the party early, walking carefully past those big dogs, unable to shake my revulsion.