We suffer -- we suffer terribly -- but we don't suffer in vain. […]
Andrews and Thomson see depression as a way of bolstering our feeble analytical skills, making it easier to pay continuous attention to a difficult dilemma. […] If depression didn't exist -- if we didn't react to stress and trauma with endless ruminations -- then we would be less likely to solve our predicaments. Wisdom isn't cheap, and we pay for it with pain.