As I noted previously, I have been working on an extended edition of the short primer on the heart of the Gospel. I recently finished it and made it available for purchase (or for reading online). It is over twice the length of the short primer text. I hope that you will find this book (even though imperfect) fruitful and life-changing. It has been in long gestation and speaks of the central mysteries of human existence, which I believe we desperately thirst to know and experience to be truly happy. May God grant us all this happiness in the breathtaking beauty of his love.
Below are links to the published edition as well as to the online text on this website:
AT THE HEART OF THE GOSPEL: THE LOVE IN WHOM ALL LINES CONVERGE