Aeschylus

For the poison of hatred seated near the heart doubles the burden for the one who suffers the disease; he is burdened with his own sorrow, and groans on seeing another's happiness.
For the poison of hatred seated near the heart doubles the burden for the one who suffers the disease; he is burdened with his own sorrow, and groans on seeing another's happiness.
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burden  disease  double  

These are some quotes by Greek author Aeschylus Poet, who lived between 525 BC and 456 BC.