“We have no reason to fear lest a habit of conscientious inquiry should paralyse the actions of our daily life.
But because it is not enough to say, "It is wrong to believe on unworthy evidence," without saying also what evidence is worthy, we shall now go on to inquire under what circumstances it is lawful to believe on the testimony of others; and then, further, we shall inquire more generally when and why we may believe that which goes beyond our own experience, or even beyond the experience of mankind.”

The Ethics of Belief (1877), The Limits Of Inference

The Ethics of Belief (1877), The Duty of Inquiry
Context: A bad action is always bad at the time when it is done, no matter what happens afterwards. Every time we let ourselves believe for unworthy reasons, we weaken our powers of self-control, of doubting, of judicially and fairly weighing evidence. We all suffer severely enough from the maintenance and support of false beliefs and the fatally wrong actions which they lead to, and the evil born when one such belief is entertained is great and wide. But a greater and wider evil arises when the credulous character is maintained and supported, when a habit of believing for unworthy reasons is fostered and made permanent. If I steal money from any person, there may be no harm done from the mere transfer of possession; he may not feel the loss, or it may prevent him from using the money badly. But I cannot help doing this great wrong towards Man, that I make myself dishonest. What hurts society is not that it should lose its property, but that it should become a den of thieves, for then it must cease to be society. This is why we ought not to do evil, that good may come; for at any rate this great evil has come, that we have done evil and are made wicked thereby. In like manner, if I let myself believe anything on insufficient evidence, there may be no great harm done by the mere belief; it may be true after all, or I may never have occasion to exhibit it in outward acts. But I cannot help doing this great wrong towards Man, that I make myself credulous. The danger to society is not merely that it should believe wrong things, though that is great enough; but that it should become credulous, and lose the habit of testing things and inquiring into them; for then it must sink back into savagery.

1997 Senate confirmation hearing, reported in Deborah Tedford, " "Senate Will Have To Confirm Court Choice http://www.npr.org/templates/story/story.php?storyId=104532843&ft=1&f=3", NPR (26 May 2009).

Source: https://www.vanguardngr.com/2021/10/nigeria-61-eie-11-light-hope-power-and-voice-opinion/ Speaking about Nigeria (October 18 2021 )

1960s, Inaugural address (1965)
Context: In each generation, with toil and tears, we have had to earn our heritage again. If we fail now, we shall have forgotten in abundance what we learned in hardship: that democracy rests on faith, that freedom asks more than it gives, and that the judgment of God is harshest on those who are most favored. If we succeed, it will not be because of what we have, but it will be because of what we are; not because of what we own, but, rather because of what we believe. For we are a nation of believers. Underneath the clamor of building and the rush of our day's pursuits, we are believers in justice and liberty and union, and in our own Union. We believe that every man must someday be free. And we believe in ourselves.

Orthodoxy (1884)

Source: What Got You Here Won't Get You There, 2008, p. 24 (in 2010 edition)

Democratic National Convention Address (1984)

Introductory
A Treatise on Man and the Development of His Faculties (1842)