Find free online books by John Piper and others can be found here at desiringGod.org.
Although it may be difficult to read books online without a book reader or laptop, you can still sample them to see if you would want to buy one. The book Desiring God also has a study guide that can be printed out for small group Bible study use.
We are taking a class “God-Centered Living” I would like to read the required reading on line. I cannot access it. Today we are required to read FUTURE GRACE pp 53-61. I cannot find this on line.
There is a sample (PDF) of Future Grace which goes up to page 61.
Jeff