"Awareness of our highly destructive pollution levels has been key to our becoming more environmentally responsible. When Al Gore's Oscar-winning documentary on climate change (appropriately named An Inconvenient Truth) was released, it alerted millions of people to a potential man-made catastrophe - global warming. The message was quite apocalyptic, yet it helped create a positive change in people's attitudes toward the environment, increasing recycling and decreasing pollution.
So the truth is often painful, but less painful than ignoring it. It may seem preferable in the short term to be overconfident (whether that relates to phenomena such as health and global warming or to our own abilities), but ultimately, being aware of our own limitations - and, in particular, our defects - can help us reverse and combat their effects."
- from Confidence, by Tomas Chamorro-Premuzic