Thanks for your reply.
I agree on the fact that lying to make yourself feel better is not helpful. Actually, I also rarely lie to make other people feel better. But I still do sometimes. I'm not sure it's for the greater good though. I guess I just feel uncomfortable telling the truth, as it would create an awkward situation :-)
Anyway, I try to do it as less as possible.
By the way, how do you know you are lying for the greater good? Unless you know the big picture...