How does Desmond Tutu use imagery in No Future Without Forgiveness?

Imagery:

"... I realize how much I used to take for granted-the love and devotion of my wife, the laughter and playfulness of my grandchildren, the glory of a splendid sunset, the dedication of my colleagues."

"Two convicts escape from a chain gang. They are manacled together, the one white, the other black. They fall into a ditch with slippery sides. The one convict claws his way nearly to the top and out of the ditch but cannot make it because he is bound to his mate, who has been left at the bottom in the ditch. The only way they can make it is together as they strive up and up and up together and eventually make their way over the side wall and out.”