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Background: I am currently tossing around a concept in my head about a species that, for lack of a better term, is immortal. "Death" to them is only in reference to their physical body and is largely seen as an inconvenience more than anything else. Assume that they, as a sentient species, have no knowledge of any sentient species, since that makes it fairly easy.
Questions: What would such a species be motivated by? What would force them to advance and thrive?
For a human, it would be their own survival and the survival of their progeny, but it isn't exactly a threat for an "immortal" species.
Edit: For all intents and purposes, the idea I have been kicking around is that this race would be about as advanced as humans. They have infinite time, but they haven't spent infinite time.