You will never reach your destination if you stop and throw stones at every dog that barks.
Winston Spencer Churchill.
Sir Winston Churchill, the British wartime Prime Minister, used the childhood expression “Black Dog”, to describe periods of altered, gloomy mood, that plagued him throughout his life.
These dips in mood could be so severe as to render him bed bound, yet they usually recovered over a period of weeks. Despite this, he managed to lead the United Kingdom from almost certain defeat to victory.
The expression, Black Dog, has since become almost synonymous with depression.