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Paperback | $22.50 Short | £15.95 | ISBN: 9780262511940 | 373 pp. | 6 x 9 in | January 2006

"“University Presses in Space” showcases a special sampling of the many works that university presses have published about space and space exploration."

Belief’s Own Ethics


The fundamental question of the ethics of belief is "What ought one to believe?" According to the traditional view of evidentialism, the strength of one’s beliefs should be proportionate to the evidence. Conventional ways of defending and challenging evidentialism rely on the idea that what one ought to believe is a matter of what it is rational, prudent, ethical, or personally fulfilling to believe. Common to all these approaches is that they look outside of belief itself to determine what one ought to believe.

In this book Jonathan Adler offers a strengthened version of evidentialism, arguing that the ethics of belief should be rooted in the concept of belief—that evidentialism is belief's own ethics. A key observation is that it is not merely that one ought not, but that one cannot, believe, for example, that the number of stars is even. The "cannot" represents a conceptual barrier, not just an inability. Therefore belief in defiance of one's evidence (or evidentialism) is impossible. Adler addresses such questions as irrational beliefs, reasonableness, control over beliefs, and whether justifying beliefs requires a foundation. Although he treats the ethics of belief as a central topic in epistemology, his ideas also bear on rationality, argument and pragmatics, philosophy of religion, ethics, and social cognitive psychology.

About the Author

Jonathan E. Adler is Professor of Philosophy at Brooklyn College and the Graduate School, CUNY.


"A beautiful book that is exceptionally learned and rich.", Igor Douven, Ars Disputandi

"The best single-book treatment of the problem of the ethics of belief, in defense of a strongly evidentialist view ."—