Goals are finite, discrete outcomes we are responsible for achieving, locations to arrive at. They are commitments through assignments or initiatives. They are supposed to be realistic even as they might be aspirational. We succeed or fail in fulfilling them. Partial fulfillment is failure.
Dreams are lenses, not locations. Their value is revealing new possibilities to realize in the present. They inspire, energize and engage us in progress towards these possibilities. Progress is by definition achievable. As they leverage learning, they are infinite in their form and path. There is no arrival, only progress on the Agile path.