Right now, you can get R. C. Sproul’s 17-volume Crucial Questions series for free!
Throughout these 17 books, Sproul explores the core questions people ask about Christianity. You’ll get titles like Can I Be Sure I’m Saved?, Does God Control Everything?, What Is Faith?, and Who Is the Holy Spirit?—books that give you simple, biblical responses to some of the most challenging issues in apologetics and evangelism. (Note you don’t have to invest any money in Logos to read this material. They have a free Vyrso Reader).