I've got an offer to do a PhD at a great uni in the UK, in a scientific topic I find really interesting because of some courses I've taken at Master's level.
My dissertation advisor seems to think that being interested in a topic isn't strong enough as a motivation, and that I should be passionate about the topic and have a clear idea of why I want to study it and what it will lead me into.
I wouldn't say I'm passionate about this topic, but I wouldn't say I've studied anything in enough detail to be passionate about anything in particular yet. All I know is that I found this topic interesting and stimulating. People usually get passionate about things when they start doing them at a really high level, which I haven't had a chance to do yet.
Regarding what it would lead me into - I don't know exactly what I want to do in life yet, but research really appeals to me, and so does academia.
Is this reason enough to accept the offer, or should I reject it and wait until I become passionate about a particular area and know exactly what I want to do in life?