i think who said those words was Carl Sandburg not Carl Sagan.

Also, it is using – unfairly and illegally – the artwork of an unacknowledged, uncredited photographer! This was taken by Thomas Zimmer on Sylt Island, Germany in Nov 2010, entitled "My God, It's Full of Stars" . To add insult to injury, "John", or whoever ripped it off in the first place, has used a really poor resolution version, greatly diminishing its beauty!
The full quote, NOT from Sagan but Sandburg, is “I am idealist. I don't know where I'm going, but I'm on my way.“
—Carl Sandburg, Incidentals (1907)