A pursued ambition...
An unquenched passion...
An insatiable heart...
"Dreams are the touchstones of our character."
-Henry David Thoreau
"Dreaming is an act of pure imagination, attesting in all men a creative power, which if it were available in waking, would make every man a Dante or Shakespeare." -H.F. Hedge
"The substance of the ambitious is merely the shadow of a dream."
-William Shakespeare