“It was not the freedom of imagination that pushed me to go beyond the boundaries of what my humanity meant. Rather it is reality itself which affirms that I am nothing less than an ordinary human being. In other words, as freely as birds fly in the sky, at one time they need reality as a place to stand on.”
#Imagination and reality
Related quotes

R. Buckminster Fuller on Education (University of Massachusetts Press, 1979), p. 130
1970s
Context: Up to the Twentieth Century, reality was everything humans could touch, smell, see, and hear. Since the initial publication of the chart of the electromagnetic spectrum, humans have learned that what they can touch, smell, see, and hear is less than one-millionth of reality. Ninety-nine percent of all that is going to affect our tomorrows is being developed by humans using instruments and working in ranges of reality that are nonhumanly sensible.

“Human imagination is immensely poorer than reality.”
This Business of Living (1935-1950)

Sam Harris at Sydney Opera House Festival of Dangerous Ideas 2012, Discussion on Free Will http://www.youtube.com/watch?v=JM3raA1EwrI.
2010s
Getting Started, p. 5
How to Argue and Win Every Time (1995)
Context: While birds can fly, only humans can argue. Argument is the affirmation of our being. It is the principal instrument of human intercourse. Without argument the species would perish. As a subtle suggestion, it is the means by which we aid another. As a warning, it steers us from danger. As exposition, it teaches. As an expression of creativity, it is the gift of ourselves. As a protest, it struggles for justice. As a reasoned dialogue, it resolves disputes. As an assertion of self, it engenders respect. As an entreaty of love, it expresses our devotion. As a plea, it generates mercy. As charismatic oration it moves multitudes and changes history. We must argue — to help, to warn, to lead, to love, to create, to learn, to enjoy justice — to be.

Source: Striking Thoughts (2000), p. 15 - 16

Source: On Nietzsche (1945), p. xxx