How does Aleksandr Isaevich Solzhenitsyn use imagery in Cancer Ward?

Imagery:

The cells of the heart which nature built for joy die through disuse. That small place in the breast which is faith's cramped quarters remains untenanted for years and decays.

"A beast gnawing at its prey can be happy too, but only human beings can feel affection for each other, and this is the highest achievement they can aspire to."