"Oh I'm sorry, I'd love to but I can't". Would you actually love to though? Then why can't you? Are you just trying to be nice? Is this not lying? It can't be lying because we are saying it in love to keep the peace and not hurt anyone. However - we've been trained to lie and are possibly doing more harm to the other person as well as the way we ourselves might be viewed than we may realize. "It's just the way the world works" is a poor excuse and a poor way to live if we want to be viewed as trustworthy people.