India, Aug. 30 -- Of the negative emotions that rob us of calmness from time to time, guilt would rank quite high. The feeling of having wronged someone can sap our inner strength and confidence rather badly, and it's only worse if that someone happens to be a parent, who is ageing towards ill-health by the day. I'll tell you why I'm talking about this serious yet pertinent stress this week. It started with a friend's Facebook post. He mulled over the guilt of pursuing a career in a fast-paced metro instead of being with his retired parents, who live in a small town. My first impulse was to feel sympathy because he's an only child, and therefore, the only one responsible for taking care of them. But one look at how people related with his post and I realised that this stress is all-pervasive....