Are people fundamentally wonderful? Are they loving, kind and happy? Or do they secretly harbour grudges and selfish plans to impede one another's progress? Our answers to questions like these depend on the mood that we happen to find ourselves in. When things look good, we feel good. And when we feel good, we see the good in those around us. Whenever you have formed a negative impression of someone, it may be partly because you were both under pressure the last time you interacted. Things may be better next time.