Heart disease

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…the tree which sprouted from one bad thought. Why does Blake use the symbol of a tree to convey his message? Because God uses trees in various parables. All trees appear to be beautiful on the outside, but on the inside they contain insects, rodents, and debris. The tree serves as a perfect replica of the human soul. It goes through numerous emotions (fears, tears, smiles, etc.), just as the tree matures in various stages.