Bible Studies

Come and See (Book of John)

Greater Things (Book of Matthew)

AdventSource Literature

Public Campus Books

Interpreting Ellen G. White's Writings

Here are some very helpful principles. Reading them for yourself and then reading and discussing them with others is probably an effective plan. That way you've already rustled up your own questions on the principles and can engage in more fruitful dialogue.  

Neither these principles, nor the writings of Ellen G. White are to replace Bible study. Where relevant, they can accompany Bible study. But all Bible studies should be first and foremost a study of the Bible as we've come to know it via 66 books from Genesis to Revelation.