“So many of our dreams at first seem impossible, then they seem improbable, and then, when we summon the will, they soon become inevitable.”
Speech at the Democratic National Convention (26 August 1996) http://www.chrisreevehomepage.com/sp-dnc1996.html
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Christopher Reeve 18
actor, director, producer, screenwriter 1952–2004Related quotes

“There are many things that seem impossible only so long as one does not attempt them.”
Si le grain ne meurt [If It Die] (1924), ch. III
Source: Autumn Leaves
Letter to the editor [untitled], The New York Times (1968-03-24)

“All that we see or seem
Is but a dream within a dream.”
"A Dream Within a Dream" (1849).
Context: You are not wrong, who deem
That my days have been a dream;
Yet if hope has flown away
In a night, or in a day,
In a vision, or in none,
Is it therefore the less gone?
All that we see or seem
Is but a dream within a dream.

D 6
Aphorisms (1765-1799), Notebook D (1773-1775)

“When our memories outweigh our dreams, it is then that we become old.”

“When so many are lonely as seem to be lonely, it would be inexcusably selfish to be lonely alone.”
Don Quixote in Prologue
Variant: When so many are lonely as seem to be lonely, it would be inexcusably selfish to be lonely alone.
Source: Camino Real (1953)