What is the Christian's unique understanding of the phrase
"forgiveness of sin"?

Other religions of the world use the phrase "forgiveness of sin";
BUT we, Christians, have a unique understanding of what is means,
and how we apply it in our daily lives. We believe that
"Forgiveness of Sin" comes in two parts:

1. God's forgiveness of mankind, (vertical); and ---
2. Man's forgiveness of his fellowman, (horizontal).

From page 230, Always Growing in the Faith by Gene Dirr.
Available at www.amazon.com.