Today begin the Novena of the Chaplet of Divine Mercy.
Over the years this 'blog has existed, I have gently reminded my readers of this relatively new devotion. The original post in 2006, "Jesus, I Trust In You", and the 2011 version, Reminded Of Mercy, provide the basics on the "how to" and "why".
This line from the Roman Canon/Eucharistic Prayer I says it best--
"To us, also, your servants, who, though sinners, hope in your abundant mercies,..."