“I am a forgettable leaf on a tree.”
Source: Wicked: The Life and Times of the Wicked Witch of the West
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Gregory Maguire 87
Novelist 1954Related quotes
“The bud is on the bough again,
The leaf is on the tree.”
The Meeting of Spring and Summer, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

March 7, 1798
This was turned into Coleridge's Christabel, lines 48-50:
There is not wind enough to twirl
The one red leaf, the last of its clan,
That dances as often as dance it can.
Diaries
Travis McGee series, A Deadly Shade of Gold (1965)
Context: I think there is some kind of divine order in the universe. Every leaf on every tree in the world is unique. As far as we can see, there are other galaxies, all slowly spinning, numerous as the leaves in the forest. In an infinite number of planets, there has to be an infinite number with life forms on them. Maybe this planet is one of the discarded mistakes. Maybe it's one of the victories. We'll never know.

“Every leaf speaks bliss to me, fluttering from the autumn tree.”

"Strange Fruit" (1939). Though Holiday's renditions made this anti-lynching song famous, it was written by Abel Meeropol (using his pseudonym "Lewis Allen").
Misattributed

A Hereditary Book on the Art of War (1632)

Letter to Eric Kennington (6 May 1935)