Attempting to Achieve

Last summer, I went to the Crystal Cathedral in Anaheim, California. In one of the buildings, a giant steel quote sat on a white all that asked, "What dreams would you dream if you knew you could not fail?"
What would you attempt to achieve if you knew you could not fail?

Dreamers

Please answer the following questions. Make sure to respond off one another and if you can; try to pose a question for others to answer.

If you are a dreamer, do you have to be more careful/vigilant? Explain. Do the characters in Gatsby have a dream? Is idealism just a way for people to escape reality? How might this tie in with someone like Jay Gatsby/James Gatz?
Nick says to Gatsby, "You can't repeat the past." What do you think? Are there repercussions?