1)

"The republic is a dream.

Nothing happens unless first a dream."

--Carl Sandburg, "Washington Monument by Night," 1922

2) 

"Ya' gotta have a dream. If you don't have a dream,

How ya' gonna have a dream come true?"

--Oscar Hammerstein, "Happy Talk," from the musical South Pacific

3)

"People who don't have nightmares don't have dreams."

--Robert Paul Smith