How does Elizabeth George Speare use imagery in The Bronze Bow?

Imagery:

"What is the kingdom of heaven?" he answered. "It is like a merchant in search of fine pearls, who, on finding one pearl of great value, went and sold all that he had and bought it. Or the kingdom of heaven is like a net which was thrown into the sea and gathered fish of every kind -"

"He says that the only chains that matter are fear and hate, because they chain our souls. If we do not hate anyone and do not fear anyone, then we are free."