A man is born into this world with only a tiny spark of goodness in him. The spark is God, it is the soul; the rest is ugliness and evil, a shell. The spark must be guarded like a treasure, it must be nurtured, it must be fanned into flame. It must learn to seek out other sparks, it must dominate the shell. Anything can be a shell, Reuven. Anything. Indifference, laziness, brutality, and genius. Yes, even a great mind can be a shell and choke the spark.