From the Fall 2012 quarterly magazine Marian Helper. 
www.marian.org

Fr. Joe Roesch, MIC takes questions.

"Q. What were Jesus' most important  revelations to St. Faustina? Why? "

Here's a brief fragment:

"A ... Further, receiving Divine Mercy is an important means to prepare for the Lord's Second Coming.

"In His great mercy, the Lord wants to give grace to all people before the final judgment, so no one can say that he or she had never heard of God's mercy..."

In the next question, Fr. Joe quotes what St. Jerome has to tell us about why Catholics venerate relics...

Yet another brief fragment:

"We do not worship, we do not adore, for fear that we should bow down to the creature rather than to the Creator, but we venerate the relics of the martyrs in order the better to adore Him whose martyrs they are ..."