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What makes people hard-hearted is this, that each man has, or fancies he has, as much as he can bear in his own troubles.

Arthur Schopenhauer (2014). “Suffering, Suicide and Immortality: Eight Essays from The Parerga”, p.41, Courier Corporation
What makes people hard-hearted is this, that each man has, or fancies he has, as much as he can bear in his own troubles.