“A man cannot be too careful in the choice of his enemies.”

Source: They'd Rather Be Right (1954), p. 48.

Freeman (1948), p. 169

1960s, The American Promise (1965)
Context: For Negroes are not the only victims. How many white children have gone uneducated, how many white families have lived in stark poverty, how many white lives have been scarred by fear, because we have wasted our energy and our substance to maintain the barriers of hatred and terror? So I say to all of you here, and to all in the Nation tonight, that those who appeal to you to hold on to the past do so at the cost of denying you your future. This great, rich, restless country can offer opportunity and education and hope to all: black and white, North and South, sharecropper and city dweller. These are the enemies: poverty, ignorance, disease. They are the enemies and not our fellow man, not our neighbor. And these enemies too, poverty, disease and ignorance, we shall over, come.

Source: Discipleship (1937), The Enemy, the "Extraordinary", p. 150.

Source: Power and Innocence (1972), Ch. 11 : The Humanity of the Rebel
Context: The authentic rebel knows that the silencing of all his adversaries is the last thing on earth he wishes: their extermination would deprive him and whoever else remains alive from the uniqueness, the originality, and the capacity for insight that these enemies — being human — also have and could share with him. If we wish the death of our enemies, we cannot talk about the community of man. In the losing of the chance for dialogue with our enemies, we are the poorer.

Source: Home Truths (1859), Ch. II: "Repent, or Perish", p. 73

As quoted in "Debriefing Mike Murphy" https://www.weeklystandard.com/matt-labash/debriefing-mike-murphy (18 March 2016), by Matt Labash, The Weekly Standard
2010s

The Complete Neurotic's Notebook (1981), Women & men

Source: The Proud Highway: Saga of a Desperate Southern Gentleman, 1955-1967