“Our prejudices — we all have them — are part of our personality structure. The problem is that our prejudices may lie lurking at the bottom of the subterranean mind where the slowly ooze up and color our thinking without our knowing it.”

1920s, The Press Under a Free Government (1925)
Context: The great difficulty in combating unfair propaganda, or even in recognizing it, arises from the fact* that at the present time we confront so many new and technical problems that it is an enormous task to keep ourselves accurately informed concerning them. In this respect, you gentlemen of the press face the same perplexities that are encountered by legislators and government administrators. Whoever deals with current public questions is compelled to rely greatly upon the information and judgments of experts and specialists. Unfortunately, not all experts are to be trusted as entirely disinterested. Not all specialists are completely without guile. In our increasing dependence on specialized authority, we tend to become easier victims for the propagandists, and need to cultivate sedulously the habit of the open mind. No doubt every generation feels that its problems are the most intricate and baffling that have ever been presented for solution. But with all recognition of the disposition to exaggerate in this respect, I think we can fairly say that our times in all their social and economic aspects are more complex than any past period. We need to keep our minds free from prejudice and bias. Of education, and of real information we cannot get too much. But of propaganda, which is tainted or perverted information, we cannot have too little.

That is my last word. Think over it.
The Apple Cart (1928) Preface
1920s

As quoted in Thinking to Some Purpose (1939), p. 204

Letter to John Benson (5 October 1770); published in Wesley's Select Letters (1837), p. 207
1770s

[Remarks by the President Announcing Judge Merrick Garland as his Nominee to the Supreme Court, Merrick, Garland, w:Merrick Garland, The White House, March 16, 2016, https://en.wikisource.org/wiki/Remarks_by_the_President_Announcing_Judge_Merrick_Garland_as_his_Nominee_to_the_Supreme_Court#Remarks_by_Judge_Garland]; quote then excerpted in:
[March 18, 2016, http://www.thestandard.com.hk/section-news.php?id=167418, Obama warns foes on top court pick, March 18, 2016, The Standard]
Remarks by Judge Garland upon nomination to Supreme Court of the United States (2016)

"Bigotry That Hurts Our Military" in The Washington Post (14 May 2007).
Context: I have had the rich satisfaction of knowing and working with many openly gay and lesbian Americans, and I have come to realize that "gay" is an artificial category when it comes to measuring a man or woman's on-the-job performance or commitment to shared goals. It says little about the person. Our differences and prejudices pale next to our historic challenge.

Source: Practical Ethics, 3rd Edition (2011), Ch. 3: Equality for Animals? (p. 49)

Source: Dear Ijeawele, or A Feminist Manifesto in Fifteen Suggestions