"We are first and foremost trapped in the subjective world of the mind and can never exist beyond it as it is our only certainty."
—Maria Beville, Gothic-Postmodernism: Voicing the Terrors of Postmodernity (2009)

"The only certainty is risk."
—William Campbell, Dead Forever: Apotheosis: Book 2 (2010)

"Our only certainty may be that we feel uncertain about our future."
—Caren Goldman, Healing Words for the Body, Mind, and Spirit (2009)

"The only certainty that we have is that we are not alone."
—Mary Kay Kelley, Celebrating the Lectionary (2010)

"Our only certainty is that dissonance is a source of motivation."
—Bella DePaulo & Leah Wilson, The Psychology of Dexter (2010)

"It would be bitterly cold, the only certainty of the days ahead."
—Scott Ridley, Morning of Fire (2010)

"Our only certainty is that the new world will be something different from what we were used to."
—Carl Jung, qtd. in Carl Jung and Soul Psychology

"Our only certainty is that the wheel will turn."
—Pamela Kristan, The Spirit of Getting Organized

"That good and ill shall follow one another is our only certainty."
—Marion Zimmer Bradley, Lady of Avalon

Certainty #62:

"The only certainty is that if you do not put in the work, you will have no impact."
—Willard C. Richan, Beyond Altruism, 1987

Certainty #61:

"Indeed, the only certainty is that technology will become more powerful."
—Edwin H. McConkey, Human Genetics, 1993

Certainty #60:

"The only certainty is that writing takes the form of language."
—Nicholas Pagan, Rethinking Literary Biography, 1993

Certainty #59:

"The only certainty is that it is always man who interprets, who assigns meaning.  And that is the gist of the matter for psychology."
—Carl Gustav Jung, The Practice of Psychotherapy, 1966

Certainty #58:

"The only certainty that man can attain is the moral certainty that every human personality has inviolable worth, but no human being has or can have valid metaphysical knowledge."
—Carl F. H. Henry, God, Revelation and Authority, 1999

Certainty #57:

"The only certainty is that a library is a triumph over nothingness."
—Ilan Stavans, The Essential Ilan Stavans, 2000

Certainty #56:

"The only certainty is the tautology. (A rose is a rose is a rose.)"
—Roger D. Sell, Literature and the New Interdisciplinarity, 1994

Certainty #55:

"The only certainty seems to be that our planet will become uninhabitable (even for bacteria) when the Sun swells up to become a red giant as it nears the end of its life."
—John Gribbin, The Origins of the Future, 2007

Certainty #54:

"The only certainty is that there will be pain; how much, which joints will be affected and how mobile they will be is never known in advance."
—David Locker, Disability and Disadvantage, 1983

Certainty #53:

"The only certainty that remains then is thought itself."
—Bert Roebben, Practical Theology and the Interpretation of Crossing Boundaries, 2003

Certainty #52:

"The only certainty, the only 'truth,' is fear."
—Catherine S. Cox, Gender and Language in Chaucer, 1997