The Arena by Saint Ignatius Brianchaninov

The Arena is one of the Saint Ignatius' most famous books. It functions as guidelines for the monastic life but in it, are valuable lessons for the average person trying to improve their spiritual life. The saint teaches about sins that we didn't even know exist for example curiosity and also other valuable lessons like the dangers of interpreting dreams. It is a must read for all Christians to learn the straight and narrow path.