The birth and death that constitute depression occur at once. I returned, not long ago, to a wood in which I had played as a child and saw an oak, a hundred years dignified, in whose shade I used to play with my brother. In twenty years, a huge vine had attached itself to this confident tree and had nearly smothered it. It was hard to say where the tree left off and the vine began. The vine had twisted itself so entirely around the scaffolding of tree branches that its leaves seemed from a distance to be the leaves of the tree; only up close could you see how few living oak branches were left,
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