Two possible examples:
Silver being polished. Silver always has the potential to be shiny and beautiful, but this is somewhat obscured when it is not regularly polished. This can be seen as a metaphor for a righteous soul. Constant prayer and adherence to Christian tradition is the way in which a soul becomes "polished" or clean, and the potential for goodness that humans have can shine through.
A river flowing through a field. The water a river carries can be seen as the teachings of Christian religion. When the river waters the field, which is the human soul, the most beautiful things grow. The beautiful things that grow in the field are flowers and crops. The things that grow in the soul are good sentiments and thoughts.