“Suspecting and knowing are not the same.”

Source: Night-Thoughts (1742–1745), Night I, Line 417.

Phrases and Philosophies for the Use of the Young (1894)

The Pleasures of Love (1961).
Context: The pleasures of love are for those who are hopelessly addicted to another living creature. The reasons for such addiction are so many that I suspect they are never the same in any two cases. It includes passion but does not survive by passion; it has its whiffs of the agreeable vertigo of young love, but it is stable more often than dizzy; it is a growing, changing thing, and it is tactful enough to give the addicted parties occasional rests from strong and exhausting feeling of any kind.

marginal note in Moncure D. Conway's Sacred Anthology
quoted by Albert Bigelow Paine in Mark Twain: A Biography (1912)

Chuck Klosterman IV: A Decade of Curious People and Dangerous Ideas (2006), Recognizing Your Nemesis

Source: The Curse of Chalion

Referring to Kathleen Hensman, a Delray Beach, Florida public librarian informing police about 9/11 suspects having used computers in the library where she works
"A Nation Challenged: Questions of Confidentiality; Competing Principles Leave Some Professionals Debating Responsibility to Government" http://query.nytimes.com/gst/abstract.html?res=F00E13F83E5E0C708EDDA80994D9404482 by David E. Rosenbaum, The New York Times (November 23, 2001)

Source: The Duke and I

286.25-27
Finnegans Wake (1939)