The relief people express when a doctor says their depression is “chemical” is predicated on a belief that there is an integral self that exists across time, and on a fictional divide between the fully occasioned sorrow and the utterly random one. The word chemical seems to assuage the feelings of responsibility people have for the stressed-out discontent of not liking their jobs, worrying about getting old, failing at love, hating their families. There is a pleasant freedom from guilt that has been attached to chemical. If your brain is predisposed to depression, you need not blame yourself
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