“The final sin of man, said Luther truly, is his unwillingness to concede that he is a sinner. The significant contribution of modern culture to this perennial human inclination lies in the number of plausible reasons which it was able to adduce in support of man's good opinion of himself.”
vol. 1, p. 121
The Nature and Destiny of Man: A Christian Interpretation (1941)
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Reinhold Niebuhr 65
American protestant theologian 1892–1971Related quotes

As quoted after his arrest for treason; see Treason: the story of disloyalty and betrayal in American history http://books.google.com/books?id=lXZKAAAAMAAJ&q=%E2%80%9CIf+a+man+isn%27t+willing+to+take+some+risk+for+his+opinions,+either+his+opinions+are+no+good+or+he%27s+no+good%E2%80%9D&dq=%E2%80%9CIf+a+man+isn%27t+willing+to+take+some+risk+for+his+opinions,+either+his+opinions+are+no+good+or+he%27s+no+good%E2%80%9D&hl=en&sa=X&ei=RgacUteRAZDYoATC1IDYCg&ved=0CDcQ6AEwAjgU by Nathaniel Weyl (1950), p. 400

since it is at odds with itself, and since it does not tolerate any lasting principle within itself
Kant, Immanuel (1996), page 246
Anthropology from a Pragmatic Point of View (1798)

“Reasoning will never make a man correct an ill opinion, which by reasoning he never acquired…”
Letter to a Young Clergyman (January 9, 1720), on proving Christianity to unbelievers

"The God-Idea"
What Buddhists Believe (1993)