Bible Citation

This is the meaning of the first bible citation we find at the beginning of Flowers in the Attic:

Woe to you who strive with your Maker, earthen vessels with the potter! Does the clay say to the one who fashions it, "What are you making"? or "Your work has no handles"?

After Cathy lost her father in a car accident  and then  brought to live at Foxworth Hall, she started doubting God as the best judge and until the end of the novel, the reader can see that she  is still left with a feeling of resentment towards God. 

Even though in the prologue of her book she asks  God for help, saying that God in his infinite mercy would help her find a publisher who would put her words into a book, the ending may suggest that Cathy still holds a grudge against God. I like to explain the contradiction by noting that by the time Cathy wrote the book, she may had matured more and she may  had  also realized that she may had committed acts that made her situation at Foxworth Hall even more difficult. The narrator point's of view of God had changed since she left Foxworth Hall and began writing her account of what during the time she was imprisioned at this place. 

This bible citation in itself implies that you should not contend with your maker: God, because at the end you will lose. And this Bible citation may also  be used  by the author to ask in a metaphorical way, why is there so much suffering and dead in the world.