The Twelve Steps To Holiness And Salvation by St. Alphonsus De Liguori (Church Doctor)

This book is in my top four. It is very concise. It may be lacking just a little in "why catholic?", but I like this book for the ground it covers in such a small space. "Love your enemies" is given a section pretty early, and detraction and gossip are given a few important pages in "Love for neighbor".

The 12 virtues we must all acquire to be happy in this world and to save our souls. Many of our readers rate this the most beautiful and inspiring book they have ever read. For absolutely all! One of TAN's top 5 books. Impr. 216 pgs, PB
This title may be comparable to "The Great Means of Salvation and Perfection" by Alphonso Liguori. I do not know yet. :)