“When things are going well, or when you're feeling particularly good, you can always bring yourself down by manufacturing a stream of worry-thoughts. Once you've brought yourself down by worrying, it's very tempting to inflict those worry-thoughts on others. If we're in the grip of worrying while someone around us isn't, we seem to have an almost uncontrollable urge to criticize that person until he or she jumps into the stream of negativity with us.”