“The revolutionary knows that we cannot love our people without hating those who destroy us. All true emotion has opposite poles.”

Twitter post, https://twitter.com/Ocasio2018/status/1077776366450429958 (25 December 2018)
Twitter Quotes (2018)

1950s, What Desires Are Politically Important? (1950)
Context: We love those who hate our enemies, and if we had no enemies there would be very few people whom we should love.
All this, however, is only true so long as we are concerned solely with attitudes towards other human beings. You might regard the soil as your enemy because it yields reluctantly a niggardly subsistence. You might regard Mother Nature in general as your enemy, and envisage human life as a struggle to get the better of Mother Nature. If men viewed life in this way, cooperation of the whole human race would become easy. And men could easily be brought to view life in this way if schools, newspapers, and politicians devoted themselves to this end. But schools are out to teach patriotism; newspapers are out to stir up excitement; and politicians are out to get re-elected. None of the three, therefore, can do anything towards saving the human race from reciprocal suicide.

Source: The Division of Labor in Society (1893), p. 54

"Letter to a Cuban Farmer" (1893)

Source: The Meaning Of Life, III

Interview for The Sun Magazine (2007)

1961, Speech to Special Joint Session of Congress
Context: Military and economic assistance has been a heavy burden on our citizens for a long time, and I recognize the strong pressures against it; but this battle is far from over, it is reaching a crucial stage, and I believe we should participate in it. We cannot merely state our opposition to totalitarian advance without paying the price of helping those now under the greatest pressure. We cannot merely state our opposition to totalitarian advance without paying the price of helping those now under the greatest pressure.

Speech in Berlin (24 October 1933), quoted in The Times (26 September 1939), p. 9
1930s

The True Believer (1951), Part Three: United Action and Self-Sacrifice
Context: It is easier to hate an enemy with much good in him than one who is all bad. We cannot hate those we despise. The Japanese had an advantage over us in that they admired us more than we admired them. They could hate us more fervently than we could hate them. The Americans are poor haters in international affairs because of their innate feeling of superiority over all foreigners. An American's hatred for a fellow American (for Hoover or Roosevelt) is far more virulent than any antipathy he can work up against foreigners. It is of interest that the backward South shows more xenophobia than the rest of the country. Should Americans begin to hate foreigners wholeheartedly, it will be an indication that they have lost confidence in their own way of life. <!-- p. 96