"I have thought Too long and darkly, till my brain became, In its own eddy boiling and o'erwrought, A whirling gulf of phantasy and flame..." -- Lord Byron
Depression usually yields nothing but suffering. The same is true of mania. However, often depression, especially in its phases of resolution, does contribute to a creative spurt, as the individual resolves, at least for the time being, the underlying emotional conflicts. //
Related page of mine: https://www.facebook.com/pages/Depression-and-Creativity/399254776768105
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Byron gives a vivid description of intellectual, imaginational, emotional overexcitabilites, or just excitabilites. One post on the topic: Excitabilities and Gifted People – an intro by Susan Daniels. http://highability.org/537/