“This world is all a fleeting show,
For man's illusion given;
The smiles of joy, the tears of woe,
Deceitful shine, deceitful flow,—
There's nothing true but Heaven.”

The Smile, st. 1
1800s, Poems from the Pickering Manuscript (c. 1805)

The World Is (Below the Heavens)
Below the Heavens (2007)

Source: Pride and Prejudice

(tr. Hickie 1853, vol. 1, p. 326 http://books.google.com/books?id=Cm4NAAAAYAAJ&pg=PA326)
Birds (414 BC)
Variant: Man naturally is deceitful, ever indeed, and always, in every one thing.

The Green Mile (1996)
Context: "He kill them with they love", John said. "They love for each other. You see how it was?" I nodded, incapable of speech.
He smiled. The tears were flowing again, but he smiled. "That's how it is every day", he said, "all over the world."

The Education of Henry Adams (1907)

Black-Jewish Relations: Minister Louis Farrakhan - In His Own Words https://www.jewishvirtuallibrary.org/minister-louis-farrakhan-in-his-own-words Jewish Virtual Library (27 May 2018)

Third Olynthiac http://books.google.com/books?id=n4INAAAAYAAJ&q="the+easiest+thing+in+the+world+is+self-deceit+for+every+man+believes+what+he+wishes+though+the+reality+is+often+different"&pg=PA57#v=onepage, section 19 (349 BC), as translated by Charles Rann Kennedy (1852)
Variants:
A man is his own easiest dupe, for what he wishes to be true he generally believes to be true.
As quoted in The Routledge Dictionary of Quotations (1987) by Robert Andrews, p. 255
There is nothing easier than self-delusion. Since what man desires, is the first thing he believes.

Source: 1800s, Auguries of Innocence (1803), Line 56. Compare Psalm 30:5 (KJV): "weeping may endure for a night, but joy cometh in the morning."