"Despite the human capacity to survive and adapt, traumatic experiences can alter people’s psychological, biological, and social equilibrium to such a degree that the memory of one particular event comes to taint all other experiences, spoiling appreciation of the present. This tyranny of the past interferes with the ability to pay attention to both new and familiar situations. When people come to concentrate selectively on reminders of their past, life tends to become colorless, and contemporary experience ceases to be a teacher."
-- Bessel A. Van Der Kolk [psychologist]