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Dr. Izzeldin Abuelaish, the author of I Shall Not Hate: A Gaza Doctor's Journey, told George about the pain of losing his three daughters in the Gaza War and how he's learned to cope.
He also explained why he tries not to have hate in his heart.
"We need to think, 'What can we achieve with hatred?' And 'What are we doing to others with hatred?'" he said.
"Hatred for me, from the first moment I thought of it, it's a self-destructive disease. It's a chronic, complicated disease and it doesn't go beyond the one who carries it. I see hatred as fire which burns the one who carries it."
Christiane Amanpour clip - Daughters for Life Foundation