By Cardinal Henry Edward Manning.

An examination of sin and its effects on the soul.  

The book is very helpful in understanding the nature of sin and what it does to your soul and your relationship with our Lord. It will show you how to cope with temptations. It will help you to understand that even though we think our sins to not be very big that, in the eyes of our Lord, they are very big indeed. It shows you how venial sin will lead to mortal sin and sins of omission lead to sins of commission. Best of all Cardinal Manning shows how we can gain pardon from our sins and heal our soul through penance, repentance and grace.

264 page book, originally published in 1904.

See also other books by Cardinal Henry Edward Manning:
  Internal Mission of the Holy Ghost
  Love of Jesus to Penitents
  The Temporal Power of the Vicar of Jesus Christ
  Lectures by Cardinal Manning
  Sin and It’s Consequences
  The Glories of the Sacred Heart
  Eternal Priesthood