If you haven’t already seen, R.C. Sproul has written a whole series of little books in a series called “Crucial Questions.” Titles include ‘What is Faith?’; ‘Can I Have Assurance?’; ‘What is The Church?’; ‘Who Is The Holy Spirit?’; ‘Does God Control Everything?’ etc. There’s about 18 or so in the series, each one not more than 100 pages (with wide margins, large font, and double spacing!), and the best bit – wait for it – they’re all absolutely free on Kindle. Click this link to see more. Why wouldn’t you?