This speech makes reference to the Ten Commandments. As the novel progresses, Celie begins to realise the power she has. She no longer has to 'make myself wood' - though Shug reminds her that revenge will only destroy her. Celie learns to stand up for herself not through physical violence but through the power of her voice. Religious symbolism is present in the novel but it comes to Celie through her own perceptions and not the 'white salvation' of the missionaries.
Pidgin is a non-specific term used to refer to a language that has developed between speakers of different tongues (normally stemming from trade merchants). There are many different variations of English-based pidgin languages still in use today.
The Olinka people worship rootleaf as it protects them from the elements. Their religion is based on a pantheistic belief.
Millet is a cereal crop
Cassava is a root that is eaten as a carbohydrate or ground up to make tapioca flour.
Albert Schweitzer (1875-1965) was a German-French theologian who dedicated himself to religion, music and education. He received the Nobel Peace Prize in 1953 for his philosophy Reverence for Life, which he expressed in many ways but most obviously through his founding and maintaining of the Albert Schweitzer Hospital in Lambaréné, West Africa.