I agree with you there Saffie, you're not going to change the world as a doctor. The more good you to try do, the more bad you risk doing, what with the road to hell being paved with good intentions and all that. And the professions you mentioned all have that element to them. But I disagree with you in attitude in terms of your personal work. Yes, other people could fill our places if we were gone. But its not about other people, its about you. The thing is, by doing your job well you can actually make a positive difference to your patients that someone else may not have made and you can still work with at least good intentions. So you yourself can say you did something worthwhile and get some satisfaction from that, which is worth something.