The mind is powerful: it can build and destroy anything, including itself. The well-known placebo effect is a manifestation of its ability to build while the lesser known nocebo effect is a manifestation of its ability to destroy. Example: a young man signed up for clinical tests of an experimental drug. He was unknowingly selected for the control group, which received sugar pills. Later, in a fit of depression, he swallowed the entire bottle of sugar pills intending to kill himself. Although the pills were harmless, he truly believed they were lethal. Incredibly, he started manifesting symptoms compatible with an actual overdose: he couldn’t breathe, his blood pressure dropped dangerously low. After some initial confusion at the emergency room, doctors finally figured it out and told him that he was going to be ok. He went from clinically near death to fully recovered in the course of a few hours. Such is the power of the mind. Learn more here.